Nealon is a surname of Irish origin. The name is an Anglicisation of the Gaelic Ó Nialláin meaning "descendant of Niallán". The personal name Niallán is from a diminutive of the personal name Niall.
Notable people with the name include: Aubrey Nealon (born 1971), Canadian film and television director, producer and writer Donie Nealon (born 1935), Irish hurler Jim Nealon (1884–1910), American professional baseball player Kevin Nealon (born 1953), American comedy actor Ted Nealon (1929–2014), Irish politician; TD for Sligo-Leitrim; government minister William Joseph Nealon Jr. (1923–2018), American judge Jeffrey T. Nealon (born 1963), American philosopher, professor See also Neilan