Namesakes
Harry Potter Characters:
1 character
Seamus Finnigan 
Nobel Prize Winners:
1 literature
(literature) Seamus Heaney 1995
Notable Actors and Actresses:
1 actor
Denis O'Hare (a.k.a. Seamus) 1962-
Notable Athletes:
2 soccer, 1 rugby
(soccer) Shay Given (a.k.a. Séamus) 1976-
(soccer) Séamus Coleman 1988-
(rugby) Seamus Kelly 1991-
Notable Politicians and Statespeople:
1 politician
Seamus Mallon 1936-2020
Notable Writers:
1 author
Seamus Deane 1940-
Title Characters:
1 song
(song) Seamus 1971 Seamus