Is Kristin a boy name or a girls name?

Answer 1

Kristen is traditionally a boys' name in Scandinavia and the UK, and in those places it is still used primarily for boys. However, in recent years in the U.S. it is often as a girls' name. So it can go either way.

Answer 2

With that spelling, I'd expect to see a girl.

Although, it's purely my opinion.