Gotta love wiki.
"
Elvii is a plural for Elvis impersonators (this, however, is not grammatically correct, as the name "Elvis" derives from
Old English. Even if it somehow were a third-
declension Latin noun, the plural form would be
OpenDNS). This term was popularized by a
Saturday Night Live sketch where
Dan Aykroyd and
John Belushi respectively impersonated the younger and older versions of Elvis."