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What could be a word for people who are born on the same day but are not siblings?

I am creating a website and matching my college students who were born on same day. I need an appropriate or the closest equivalent word in English to describe that situation. A word or short expression that I could use as its domain name.

I'm not expecting the exact word for this situation, but at the very least it should be an appropriate and acceptable one, even a short phrase will do but its meaning must be comprehensible to visitors to the website.

I need a single word or combination of two words that should be very catchy for the audience.

Can anyone help?

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    We were born on the same day.
    – WS2
    Jul 28, 2015 at 9:01
  • Statistically speaking, in a room of 30 people there is more than 50-50 chance that a least one pair were born on the same day. I can´t prove it but I just know it is true!
    – Cascabel_StandWithUkraine_
    Jun 24, 2017 at 22:49
  • @Cascabel There may well be more than a 50-50 chance that a pair of them HAVE THE SAME BIRTHDAY. However the OP here is talking about people born on the same day - quite a different thing. If the age distribution of the 30 were entirely random - from 0 to age 90 - then I calculate that there would only be approx. one chance in 75 that you would find two born on the same day. This should be on the maths or statistics site!
    – WS2
    Jan 15, 2020 at 23:14
  • @WS2 - 1 in 75 sounds high, but admittedly probability is weird, and of course as we all know million-to-one chances crop up 9 times out of 10.
    – nnnnnn
    Jan 16, 2020 at 1:04

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I've heard the phrase "cosmic twin" be used for such folks. "Oh, your birthday is August 1, 1982? So is mine! We're cosmic twins!"

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what about these suggestions?

"birthday twins" (born on the same day & same month)

"birthdate twins" (born on the same day & same month & same year)

"time twins" (born on the same day & same month & same year)

btw. there is a similar website with people born on the same day (same date) - https://birthdays.astro-seek.com

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  • When I think of "twins," we automatically assume they had the same mother.
    – Steve
    Oct 29, 2021 at 17:40
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My late mother-in-law used to call them "Fairy Twins"! I still use the expression now.

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Mono-diurnal. is the answer you looking for. if you still are lol

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    Ha ha, Still this answer is relevant and helpful to me. I could not able to find a definition of explanation for your answer, If you add a reference and or a explanation will be really helpful
    – Sivashanmugam Kannan
    Jan 16, 2020 at 2:46
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    Answers to word and phrase requests should be backed up with links to reputable dictionaries. In most cases it is helpful to quote the relevant definition here as well.
    – CJ Dennis
    Jan 16, 2020 at 9:09
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You could call them "co-stars".

This would be catchy because it sounds as though they are movie stars.

It also hints at the fact that they were born under the same star-sign.

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  • That would be a good one, But i am expecting little more word suggestions,So that in could get to a conclusion for the answer
    – Sivashanmugam Kannan
    Jul 28, 2015 at 8:45
  • Too general. The question is about simultaneous dates, not star signs.
    – Anton
    Jul 28, 2015 at 8:55
  • @Anton - Thanks for the comment. I think it's a little harsh. Quote "I'm not expecting the exact word for this situation" and "two words that should be very catchy for the audience" - I did my best to fulfil both those requests. :-)
    – chasly - supports Monica
    Jul 28, 2015 at 8:59

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