Tawny

wiktionary

ref

From Middle English tawne, from Anglo-Norman tawné, from Old French tané, past participle of taner(“to tan”), from tan(“tanbark, tawny color”), from Gaulish tanno(“holm oak”), from Proto-Celtic *tanno-(“green oak”), of uncertain further origin. [1] Compare Breton tann, Old Irish caerthann(“rowan”).

etymonline

ref

tawny (adj.)

"tan-colored," late 14c., from Anglo-French tauné "of or like the brownish-yellow of tanned leather," from Old French tanét "dark brown, tan" (12c., Modern French tanné), past participle of taner "to tan hides," from Medieval Latin tannare (see tan (v.)).Related: Tawniness.