Why is the ninth month called September?
c.1300, "attendant in a noble household," of unknown origin, perhaps a contraction of Old English iunge man "young man," or from an unrecorded Old English *geaman, equivalent of Old Frisian gaman "villager," from Old English -gea "district, village," cognate with Old Frisian ga, ge, from Proto-Germanic *gaujan.
Sense of "commoner who cultivates his land" is recorded from early 15c.; also the third order of fighting men (late 14c., below knights and squires, above knaves), hence yeomen's service "good, efficient service" (c.1600). Meaning "naval petty officer in charge of supplies" is first attested 1660s. Yeowoman first recorded 1852: "Then I am yeo-woman O the clumsy word!" [Tennyson, "The Foresters"]
in English history, a class intermediate between the gentry and the labourers; a yeoman was usually a landholder but could also be a retainer, guard, attendant, or subordinate official. The word appears in Middle English as yemen, or yoman, and is perhaps a contraction of yeng man or yong man, meaning young man, or attendant. Geoffrey Chaucer's Canterbury Tales (late 14th century) depicts a yeoman who is a forester and a retainer. Most yeomen of the later Middle Ages were probably occupied in cultivating the land; Raphael Holinshed, in his Chronicles (1577), described them as having free land worth 6 (originally 40 shillings) annually and as not being entitled to bear arms