Why is the ninth month called September?
c.1300, from Old English mapultreow "maple tree," also mapolder, mapuldre, related to Old Norse möpurr, Old Saxon mapulder, Middle Low German mapeldorn, from Proto-Germanic *maplo-. There also was a Proto-Germanic *matlo- (cf. Old High German mazzaltra, German maszholder), but the connection and origins are mysterious. Formerly with adjectival form mapelin (early 15c.; Old English mapuldern). Maple syrup attested from 1824, American English. The maple leaf is mentioned as the emblem of Canada from 1850.