RhymeZone: royster definitions

Definitions of Royster:

name: A surname (rare: 1 in 33333 families; popularity rank in the U.S.: #3583)

noun: A surname.
verb: Obsolete spelling of roister [(intransitive) To engage in noisy, drunken, or riotous behaviour.]
noun: Obsolete spelling of roister [(archaic) A roisterer.]

(Definitions from Wiktionary)