The source I use for Greek roots is the on-line Liddell & Scott's lexicon at http://www.perseus.tufts.edu/cgi-bin/resolveform.

There are plenty of words beginning daidal-, and it sort of looks like the name Daidalos is just a personification of the adjective 'cunning, skilful'.

However, it doesn't give any simpler root. I've searched thorugh dad- and dand- and can't think what else it might be. The root looks un-Greek. The word looks like a borrowing into Greek, that is, and that reopens the question of which came first: was it perhaps a Cretan word borrowed then personified, or a Cretan person borrowed then turned into a common word?