Namesakes
Notable Actors and Entertainers:
2 actors
Robert Lansing (a.k.a. Howell) 1928-1994 
Allison Williams (a.k.a. Howell) 1988-
Notable Athletes:
1 cycling
(cycling) Geraint Thomas (a.k.a. Howell) 1986-
Notable Musicians:
1 musician
David "The Edge" Evans (a.k.a. Howell) 1961-
Olympic Medalists:
1 gold
(gold) Geraint Thomas (a.k.a. Howell) 2008; 2012 cycling - track
Other Leaders:
1 prime minister
Prime Minister Carwyn Jones (a.k.a. Howell) 2009-2018 Wales
Rock and Roll Hall-of-Famers:
1 musician
David "The Edge" Evans (a.k.a. Howell) 2005 U2