Warnell is an uncommon given name of American origin, derived from the surname Warren, which is of English and Scottish derivation. It means 'guardian' or 'keeper of the spring'. The name Warren is believed to have originated from the Old English word 'wær-enn', a combination of 'wær' meaning 'ware' or 'beware', and '-enn' meaning 'estate'. Thus, Warnell could be interpreted as 'one who guards the estate'. This name was more prevalent in the United States during the mid-20th century but has since become quite rare.
Warnell was quite popular in 1920 and again in 1923, with five births each year. It experienced a resurgence in popularity in 1952, with six births that year. Altogether, there were sixteen Warnells born across these three years.