Ganceann means was a spirit from the Sidhe which filled girls' heads with
pleasant fantasies and daydreams when they should instead be working. The name
means "without a head" or "love talker," and thus this spirit in particular is the
personification of daydreaming.
Ganceann was also called Gancomer, and was considered to be a faerie who
preferred to spend his time making love to milkmaids and shepherdesses.
Resource
Ellis, Peter Berresford. A Dictionary of Irish Mythology. (Santa Barbara,
California: ABC-CLIO, Inc., 1987). Pages 132.