Tripp itself is often used as a nickname.
Famous people named Tripp:
Olympic swimmer Tripp Schwenk III; guitarist Tripp Eisen; golfer Tripp Isenhour III; tennis player Tripp Phillips III.
There are towns called Tripp in South Dakota, Texas, West Virginia, and Wisconsin. Perhaps your little Tripp would like to take a trip to Tripp? HAHA.