US Popularity Rank: 28764

Origin: Irish

Meaning: Alert; Watchful; Vigilant

Casi is a short and sweet girl's name with Irish origins. Meaning "watchful," "vigilant," and "alert," Casi is an excellent name for a wide-eyed baby who has a natural curiosity for their surroundings. Casi is derived from the Irish surname Casey, which gives us our name's meaning when translated from Old Irish O' Cathasaigh. You may be familiar with Casi, as seen in the character Cassie Ainsworth from Skins. Cassie is a gentle and introverted eccentric with a natural talent for observation and psychology despite facing challenges in her life.