As listed on imdb.com, Elvis appeared as:

This Is Elvis (1981) .... Himself
Elvis in Concert (1977) (TV) .... Himself
Elvis: Aloha from Hawaii (1973) (TV)
Elvis On Tour (1972) .... Himself
Elvis: That's the Way It Is (1970) .... Himself

But these are the ones I was really interested in:

Change of Habit (1969) .... Dr. John Carpenter
Trouble with Girls, The (1969) .... Walter Hale
... aka Chautauqua, The (1969)
... aka Trouble with Girls (and How to Get Into It), The (1969)
Charro! (1969) .... Jess Wade
Live a Little, Love a Little (1968) .... Greg Nolan
Speedway (1968) .... Steve Grayson
Stay Away, Joe (1968) .... Joe Lightcloud
Clambake (1967) .... Scott Heyward
Easy Come, Easy Go (1967) .... Ltjg Ted Jackson
Double Trouble (1967) .... Guy Lambert
Spinout (1966) .... Mike McCoy
... aka California Holiday (1966)
Paradise, Hawaiian Style (1966) .... Rick Richards
Frankie and Johnny (1966) .... Johnny
Harum Scarum (1965) .... Johnny Tyronne
... aka Harem Holiday (1965)
Tickle Me (1965) .... Lonnie Beale
Girl Happy (1965) .... Rusty Wells
Roustabout (1964) .... Charlie Rogers
Viva Las Vegas (1964) .... Lucky Jackson
... aka Love in Las Vegas (1964) (International: English title)
Kissin' Cousins (1964) .... Josh Morgan & Jodie Tatum
Fun in Acapulco (1963) .... Mike Windgren
It Happened at the World's Fair (1963) .... Mike Edwards
Girls! Girls! Girls! (1962) .... Ross Carpenter
Kid Galahad (1962) .... Walter Gulick
Follow That Dream (1962) .... Toby Kwimper
Blue Hawaii (1961) .... Chad Gates
Wild in the Country (1961) .... Glenn Tyler
Flaming Star (1960) .... Pacer Burton
G.I. Blues (1960) .... Tulsa McLean
King Creole (1958) .... Danny Fisher
Jailhouse Rock (1957) .... Vince Everett
Loving You (1957) .... Jimmy Tompkins (Deke Rivers)
Love Me Tender (1956) .... Clint Reno
Pied Piper of Cleveland: A Day in the Life of a Famous Disc Jockey, The (1955) .... Himself

So, that's two Johnny's, one John, one Joe, one Jimmy, one Josh, one Jess.

But also Clint, Glenn, Chad, Lonnie and Walter. And one Toby!

And as for those surnames with Jesus-like implications: two Carpenters, one Fisher (of Men?), one Lightcloud, one Gates (pearly?)... I feel a conspiracy theory coming on.

But where the hell does Kwimper come from? kWIMPer?