If by original you mean the first version used, it's probably Caley on men.
Caley /
Cayley (& variants) as a surname goes back to at least the 13th century, and pops up occasionally in the
UK as a first name - almost entirely on men - from the 18th century onwards. But it's probably unrelated to
Kaylee as a portmanteau of
Kay and
Lee, which seems to have been invented in the US. The earliest one I could find was born in 1887 in South
Carolina.
It wasn't common at all though until 1985
UK song '
Kayleigh' made the US Hot 100 Billboard chart & went to #2 in the
UK:
https://en.wikipedia.org/wiki/KayleighHere's the US popularity chart:
http://www.behindthename.com/top/name/kaley,kaylee,kayley,kayleigh
The writer of
Kayleigh said he invented the name from his girlfriend's first names
Kay &
Lee, but he wasn't the first person to come up with it - first use in the
UK was in 1937.
I don't really like any of them much, but if I had to choose one I'd probably go for
Kaylie.
This message was edited 5/27/2015, 8:15 AM