It is the Cheyenne word for "Wild
"...Although, if it's a person's name, it means "Wild One
"....it can also be used to describe someone that has a VERY free spirit & cannot & will not be tamed by anyone; Free-Spirited
....Also, someone who's completely different from everyone else; beyond the norm intelectually, artistically, socially, and/or in mindset...A Cimarron can also be someone who moves from place to place freely and willingly, without being forced to do so, also considered a "Maverick
"....also someone who fights back, mostly about what he/she believes in or thinks is right; sometimes considered a Fighter
That girl is a total Cimarron. She's completely free in spirit!...NO ONE can tell her who to be or what to do!