I like
Caitlin but it's still super popular so I wouldn't use it. My top spellings are probably
KaitlinKatelynKatelinKaitlynCaitlin
I know at least 7 Caitlins. I know how 6 of them spell it, their ages are in brackets:
Kaitlyn (19)
Kate-Lyn (4)
Caitlin (20)
Caitlyn (5)
Caitlin (9)
Katelyn (2)