Caddis \c(ad)-dis\ as a boy's name is of Old English origin, and the meaning of Caddis is "worsted fabric". Also a kind of fly that trouts like to eat, making this a potential choice for a fisherman's son.
Caddis has 2 variant forms: Caddice and Caddiss.
Baby names that sound like Caddis are Gaddis and Geddis.