Thayer's Greek Lexicon

 Gamaliel = "my recompenser is God"
1. a Pharisee and celebrated doctor of the law, who gave prudent
worldly advice in the Sanhedrin respecting the treatment of the
followers of Jesus of Nazareth. Acts 5:34 ff. (A.D. 29.) We learn
from Acts 22:3 that he was the preceptor of Paul. He is generally
identified with the very celebrated Jewish doctor Gamaliel,
grandson of Hillel, and who is referred to as authority in the
Jewish Mishna.