Loomis is a surname of Anglo-Saxon origin, derived from Old English "hloom" meaning "loud", and "es" signifying "of". It was originally a nickname given to someone who was considered noisy or boisterous. Over time, Loomis has become more commonly used as a given name for males in the United States. The name gained some popularity during the mid-20th century but is now quite rare, making it distinctive and unique.
The name Loomis peaked in popularity during the early 1900s, with a noticeable decline after the late 1920s.