What Do You Call Someone Who Has the Same Birthday as You? (15 Synonyms)
Ever met someone with your exact birthday and had a mini existential crisis? Yeah, same. It’s one of those weirdly satisfying moments where the universe feels like it just high-fived you. But then comes the awkward pause—what do you actually call that person?
“Birthday twin”? “Cosmic clone”? “Chronological soulmate”? 👀
Don’t worry, I’ve got you. In this article, we’re diving into 15 fun, weird, and sometimes totally made-up (but awesome) ways to describe someone who shares your birthday. Plus, I’ll throw in some personal takes, spicy wordplay, and mildly sarcastic commentary to keep it interesting. Because, IMO, if we’re talking about birthdays, it should never be boring.
Let’s get into it, shall we?
1. Birthday Twin (The Classic)
Let’s start with the crowd favorite: Birthday Twin.
This one’s the go-to term. Simple. Clean. Gets the job done. You meet someone born on the same day? Boom—you’re birthday twins.
But does it mean you’re alike in any way? Not really. I once met my birthday twin at a party, and they were basically my polar opposite. I’m a chill introvert, and she showed up wearing glitter heels and giving TED Talks on crystal healing. 🤷♀️
Still, the term sticks. It’s casual, cute, and universally understood.
2. Astrological Sibling
Okay, astrology fans, this one’s for you.
Calling someone your astrological sibling adds a little cosmic flair to the mix. It implies that not only do you share a birthday, but you may also share vibes, energy, or whatever Mercury’s doing that week.
Use this when:
- You’re deep into zodiac compatibility charts.
- You want to sound extra spiritual at brunch.
Bonus points if you both turn out to be Capricorns with commitment issues. 😬
3. Chrono Buddy
Yes, this one sounds like a time-travel sidekick. And honestly? I’m here for it.
Chrono Buddy sounds futuristic and adorable. It’s perfect if you’re into sci-fi or just want to make the whole birthday twin thing sound cooler than it is.
Imagine:
“Oh, you were born on July 7 too? We’re chrono buddies!”
Tell me that doesn’t slap.
4. Birthday Match
It’s like Tinder… but for birth dates.
Birthday Match is one of those terms that makes it sound like fate stepped in with a cheeky little wink. It’s direct, but still kind of sweet.
And no, you don’t have to fall in love with your birthday match. But hey, it’d make a cute origin story.
5. Date-of-Birth Doppelgänger
Try saying that three times fast.
This term is a mouthful, but it’s ridiculously fun to drop in casual convo. It gives the moment some flair, like, “Oh, we’re date-of-birth doppelgängers. NBD.”
Use this when you want to sound smart and playful at the same time.
Heads up though: your friends might roll their eyes at you. Worth it.
6. Time Twin
Kinda like birthday twin, but with a little more… edge?
Time Twin sounds more intense. Like you were born at the exact same hour. Maybe even in the same hospital. Maybe the matrix glitched. 👽
This one’s great if you want to lean into the mysterious side of shared birthdays. Just don’t start a cult over it, okay?
7. Cake Mate
Okay, hear me out.
Cake Mate is straight-up adorable. It screams friendship, frosting, and a shared love of sprinkles.
If you meet someone with your birthday and instantly click, this is the term to use. It’s lighthearted and perfect for Instagram captions:
“Met my cake mate today 🎂💫 #BirthdayVibes”
I mean… come on.
8. Birthday Clone
Here’s where it gets creepy.
Birthday Clone is what you call someone who not only shares your birthday but maybe also your hairstyle, your taste in pizza, and your weird obsession with true crime podcasts. (Looking at you, Jess from HR.)
It’s a playful nod to how uncanny these similarities can feel.
Just don’t actually call someone your clone to their face unless you’re ready to explain why you’ve been secretly watching them since third grade. 😅
9. Astro Twin
Now, this one’s legit if you’re deep into astrology. Like, “I-know-my-ascendant-sign-by-heart” deep.
An Astro Twin means you share the same birth chart (or most of it), which happens only if you’re born around the same time and place.
So yeah, it’s rare. But if you find one, consider starting a podcast together.
FYI: If you’re dating your astro twin, good luck navigating that emotional rollercoaster. LOL.
10. Cosmic Match
Romantic? Mysterious? Just a little extra? Yes to all three.
Cosmic Match gives big “meant to be” energy, but without the sappy clichés. It sounds dreamy—like your souls made a pact in another lifetime to be born on the same day.
Or maybe… you just happened to be born during Leo season and you both love attention. 🦁
Either way, it’s a vibe.
11. Birthday Bae
This one is more for your SO or your flirt of the week.
If you meet someone who shares your birthday and gives you butterflies? Birthday Bae is your move.
It’s cute, it’s cheeky, and it makes you sound like you’re already halfway into matching tattoos.
Use responsibly.
12. Zodiac Twin
This one’s a bit looser than “birthday twin”—because technically, your zodiac twin could be anyone born under the same sign, not necessarily the same day.
But still, Zodiac Twin has a cool ring to it. It’s perfect when:
- You’re into horoscopes.
- You want to sound trendy.
- You just found out your new co-worker is also a Virgo and you’re silently planning to form an earth-sign alliance.
13. Birthday Buddy
This is one of the most widely used terms after “birthday twin.”
It’s simple, friendly, and feels like the kind of thing your elementary school teacher would’ve said when two kids shared a birthday.
Still, it holds up.
And hey, there’s something kind of wholesome about saying, “That’s my birthday buddy!”
14. Shared-Birthday Pal
Okay, so this one might be the least exciting… but it does get the job done.
Shared-Birthday Pal is basically a no-frills way of saying, “Yep, we were born on the same day, and we get along.”
Not flashy, not fancy—but sometimes simple wins. Especially if you’re explaining it to your grandma and want to skip the “chrono buddy” explanations.
15. Time-Twin Flame
Now this one’s for the romantics.
It’s a mix of “time twin” and the ever-dramatic “twin flame.” Honestly, it sounds like a YA novel. And I’m not mad about it.
Time-Twin Flame works when you want to add a little spiritual spice to your shared birthday. Maybe you feel an instant connection. Maybe you think you’ve known each other in a past life. Or maybe you’re just vibing because you both hate pineapple on pizza.
Whatever the case, this one’s for the emotionally dramatic overthinkers among us. (Hi, yes, I see you.)
So, What’s the Best Term?
Here’s the thing: there’s no “official” term for someone who shares your birthday—and that’s kind of the fun of it. You get to make it your own.
Want to keep it classic? Go with birthday twin.
Feeling extra? Drop a chrono buddy or cosmic match.
Trying to flirt? Birthday bae, hands down.
It’s your moment—own it.
Final Thoughts: Why This Even Feels Special
Let’s be real—it’s not like you’re the only person born on your birthday. Millions of people probably share it.
But when you find one person with your exact date? It feels… personal. Like the universe winked at you.
It’s a small thing that sparks big conversations. Birthdays are already a reflection of who we are, so sharing yours makes you feel just a little more connected to someone, even if you just met them five minutes ago.
So next time you run into a birthday twin—whether they’re a cake mate, time twin, or full-on date-of-birth doppelgänger—don’t just shrug it off. Embrace the magic. You never know where it might lead.
(FYI: I met one of mine at a concert. We’ve been friends ever since. Shoutout to Ally—my forever cake mate 🍰✨)
