Of uncertain origin. Attempts have been made to derive it from various Germanic and Slavic roots. It was certainly in use in Poland in the 19th century, and is found in Polish folk tales as the name of a princess. The derivation may well be from the ethnic term Wend (see Wendell). The name was introduced to the English-speaking world by Ouida (Marie Louise de la Ramée), who used it for the heroine of her novel Wanda (1883).
English: from Middle English comander, comando(u)r ‘leader’, ‘ruler’, probably applied as a nickname, although Reaney suggests that the term, derived from Old French comandeor, also denoted the officer in charge of a commandery, for example of the Knights Templars, and in this sense it would have been an occupational or status name.