Isaac = "to laugh"
derivation: of Hebrew origin (03327)
http://bible.crosswalk.com/Lexicons/Greek/grk.cgi?number=2464&version=kjv

(03327)
Isaac = "he laughs"
from (06711)
http://bible.crosswalk.com/Lexicons/Hebrew/heb.cgi?number=3327&version=kjv

(06711)
1] to laugh, mock, play
   1.a] (Qal) to laugh
   1.b] (Piel)
       1.b.1] to jest
       1.b.2] to sport, play, make sport, toy with, make a toy of
http://bible.crosswalk.com/Lexicons/Hebrew/heb.cgi?number=6711&version=kjv

A link to each occurrence of this word in the homepage:
1] Isaac
2] Isaac
3] Isaac