Nyhan
Nyhan is a surname of Irish origin. It is an anglicized form of the Gaelic Ó Nialláin, meaning "descendant of Niallán". The personal name Niallán is a diminutive of Niall, a popular Irish given name. The surname is most common in the province of Ulster in Ireland, particularly in counties Tyrone and Armagh.
Notable individuals with the surname Nyhan include the American physician and biochemist W. Allen Nyhan, known