WordNet (r) 3.0 (2006):

Hillel
    n 1: Palestinian rabbi and interpreter of Judaic law

Easton's 1897 Bible Dictionary:

Hillel
   praising, a Pirathonite, father of the judge Abdon (Judg. 12:13,
   15).


Hitchcock's Bible Names Dictionary (late 1800's):

Hillel, he that praises