maverick

Named after Texan lawyer and politician Samuel Maverick (1803–1870), who refused to brand his cattle. For probable origin and meaning, see Maverick.

The poker noun sense (“a queen and a jack as a starting hand in Texas hold ’em”) may be from the theme song of the US Western television series Maverick (1957–1962), which says of the eponymous protagonist that “[g]amblin’ is his game” and that he is “livin’ on jacks and queens”.