Macklin is an Irish surname of uncertain derivation, usually read as "son of the follower of Saint John" from the Gaelic Mac Giolla Eoin. As a first name it offers the friendly nickname Mack and fits the fashion for surnames like Declan and Lachlan. In the United States Macklin hovered between number 1100 and 1700 for a decade and entered the top 1000 for the first time in 2025, at number 998.