Birth Name: Justin James Watt
Place of Birth: Waukesha, Wisconsin
Date of Birth: March 22, 1989
Ethnicity: Polish, Scottish, possibly other
Family Background: J.J. Watt is an American football defensive end for the Houston Texans of the National Football League (NFL).
J.J. Watt is the son of John David Watt and Connie Lynn (Walczak) Watt.
J.J. Watt’s paternal grandfather was James Watt who was the son of James Watt (born in Scotland) and Helen Pavlowski (Watt).
Source: http://www.churchandchapel.com/obituary/James-Watt/Pewaukee-WI/1349606 (obituary of J.J. Watt’s paternal grandfather)
https://familysearch.org/(family record of J.J. Watt’s paternal grandfather)