Cainan = "their smith"
derivation: of Hebrew origin (07018)
http://bible.crosswalk.com/Lexicons/Greek/grk.cgi?number=2536&version=kjv

(07018)
Kenan = "possession"
   1.a] also 'Cainan'
derivation: from the same as (07064)
http://bible.crosswalk.com/Lexicons/Hebrew/heb.cgi?number=7018&version=kjv

(07064)
1] nest
   1.a] nest (of bird)
   1.b] cells (like nests in Noah's ark)
derivation: contracted from (07077)
http://bible.crosswalk.com/Lexicons/Hebrew/heb.cgi?number=7064&version=kjv

(07077)
1] to make a nest
   1.a] (Piel) to make a nest
   1.b] (Pual) to be nested
http://bible.crosswalk.com/Lexicons/Hebrew/heb.cgi?number=7077&version=kjv

A link to each occurrence of this word in the homepage:
1] Cainan