Sheehan is an Irish surname and given name of Gaelic origin, derived from the Irish sept name 'Síoda'. It means 'son of John', with 'Síoda' being a form of the name 'Seán' or 'John'. In some cases, it may also be associated with other Irish families who share the name. The name Sheehan is often found in regions where Irish influence has been prominent historically.
The Sheehan name experienced peak popularity in the late 20th century, with a noticeable spike in births occurring in 1994 and 1997, each having 8 births. The total number of births for this name over this period was 69.