elvin

As a noun elven

is a female elf, a fairy, nymph.

As an adjective elven

is belonging to, or relating to, elves.

As a proper noun Elvin is

a given name.

As proper nouns the difference between elvis and elvin

is that elvis is a given name derived from surnames, possibly derived from the surname Elwes while Elvin is a given name.

As a noun Elvis

is an impersonator of Elvis Presley.

As proper nouns the difference between alvin and elvin

is that alvin is a given name derived from Old English while Elvin is a given name.