The name Innes is a boy's name of Scottish origin meaning "from the river island". Innes and is often added to lists like Names That Mean Water and discussed in our forums with posts like "Quick Question Thread?!".
From the experts:
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."