Names that relate to numbers?

So I am writing a book and in that book there will be a group of about six teens. All of these kids are aliens with special abilities and are emancipated minors.

Since these kids never had parents, they had to name themselves, and chose to do so from the order that they found each other.

Basically, I am trying to come up with names that don't sound all crazy, but fairly obviously are linked to numbers such as Monica (one, mon, like monotheistic? idk - that ones iffy) and Quin (five, quin, like quintuplets)

The gender doesn't really matter, but I hope to have three girls and three guys.

Thx everyone for your help!