A book from the 70s-80s about a young man with goat hooves who makes special boots to hide his deformity.
Young man's name is Kevin? Kelvin? Kev something.
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THE CRYSTAL GRYPHON by Andre Norton (1972)
Kerovan is the rightful heir to the throne of Ulm, but is shunned because his feet are cloven hooves. He hides this with special boots.
He is forced to flee when Ulm is invaded by raiders. He travels to the land where his betrothed lady Joisan lives, only to find that a scoundrel has stolen his identity and seeks to marry her.
But the two must join to defeat the dark magic that threatens the lands.