closest Word for people who born on same day for different mothers

What could be the closest word for the people who born on the same day who are not siblings

I am matching my college students who born on same day and creating a website for that I need appropriate or a closest relative word to describe that relation. So that which can be useful for the domain name creation.

I am not expecting the exact word for it, At least a appropriate and a acceptable one through the people should understand what i am trying to say there.

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

Can anyone help