Cronan is an Irish surname derived from the word "cron" which meant "brown" or "dark." Notable people Saint Cronan (Died 640), Abbot-bishop and patron of the diocese of Roscrea John P. Cronan, American attorney and federal district judge Michael Patrick Cronan (1951–2013), American graphic designer and artist Rich Cronin, American musician Selma Cronan (1913 – 2002), American aviator Thomas Cronan, American athlete William P. Cronan, Governor of Guam William S. Cronan, American Medal of Honor recipient See also Cronin, surname References