Girl or boy's name (3)
I believe the answer is:
kim
I believe this clue is a double definition.
'girl' is the first definition.
'boy's name' is the second definition.
(Other definitions for kim that I've seen before include "Book" , "Boy's or (now usually) girl's name" , "Rudyard Kipling novel" , "Girl" , "-- Basinger, US actress" .)