Son of the servant of John
An Anglicized version of the Scottish Gaelic Mac Gille Eathain, meaning 'son of the servant of Saint John.' It traditionally denotes a lineage of devotion to the apostle John. While historically a surname, it is occasionally used as a first name in the United States.
Less common today
Mcclain isn't in the latest US Top 1000. It last peaked at #4,093 in 2000.
Olympic gold medalist equestrian
US births per 5-year period, 1990–present (SSA data).
