It's illegal for them to use the term, for several different reasons.
2 counts dismissed in Navajo case against Urban Outfitters
Urban Outfitters Q3 FY2017 retail sales jump 3.5%
Urban Outfitters settles with Navajo Nation after illegally using tribe's name, Native Americans
Urban Outfitters gets two counts of Navajo Nation lawsuit dismissed
Urban Outfitters settles with Navajo Nation after illegally using tribe's name, Native Americans
Forever 21 Is in Trouble for Making 'Navajo' Panties, Too
Urban Outfitters settles with Navajo Nation after illegally using tribe's name, Native Americans
The Navajo tribe suing Urban Outfitters for trademark violations
Urban Outfitters in Trouble for Selling 'Navajo' Underwear
Pendleton, Urban Outfitters, and the Native American “inspiration” that makes them millions, by Mattie Bowen
Urban Outfitters Controversies
Urban Outfitters is no stranger to controversies over its fashion and product lines
