Innis is the name of an island (and Gaelic word for island) which became a Scottish surname and clan name before being used as a first. It hasn't been heard much in the U.S., but could attract more attention with the growing popularity of Latin s-ending boys' names such as Atticus.
Innis is related in sound to Ennis, as in the character name Ennis Del Mar, indelibly played by Heath Ledger in "Brokeback Mountain."
