Daddy Longlegs/Crane flies

Yesterday, some of us were outside and we saw so many Daddy Longlegs! Miss J used tally marks to record how many and we counted them together. We looked in a a book to found out they were called Crane flies and that they hatch from larvae. We had a look at one on the whiteboard and spotted wings, 6 legs and a body. Somebody wondered why they are called Daddy Longlegs?