1828, noun and adjective, in reference to a seceding group of American Quakers, from the name of their spiritual leader, Elias Hicks. The remainder of the profession (the minority numerically) were known as Orthodox Friends. The schism occurred in 1827 at the Philadelphia Yearly Meeting. The surname is from Hick, popular pet form of Richard.
About the only way I can tell whether a particular Meeting was Orthodox or Hicksite has to do with clocks and pianos. If these — particularly a clock — are present, that Meeting was Hicksite. If not, it was Orthodox. [Francis G. Brown, "Downingtown Friends Meeting," 1999]