Kalev son of Yefunne

Kalev was called a Kenizzite because he was the STEPSON of Kenaz.  After Kalev's father Yefunne died, his widowed mother married Kenaz and bore him Otni'el. Since Kalev was raised in the household of Kenaz he was called "the Kenizzite." This should be obvious since Torah specifically instructs in Num. 2:2 that one's Tribal heritage
is through the ancestory of their father, Kalev became the leader of the Tribe of Yehudah, therefore his father had to have been an