beggar (n.) Look up beggar at Dictionary.com
"one who asks alms," especially as a way of life, c. 1200, from Old French begart, "a member of the Beghards," a mendicant order of lay brothers in the Low Countries, from Middle Dutch beggaert "mendicant," a word of uncertain origin, with pejorative suffix (see -ard). The common noun is perhaps from the proper name; compare Beguine. Early folk etymology connected the English word with bag, but this is now dismissed (see OED).

From mid-14c. as "one who is indigent" (whether begging or not). From c. 1300 as "mean or low person;" as a familiar term for "a fellow, man" by 1833. Form with -ar attested from 14c., but begger was more usual 15c.-17c. The feminine form beggestere is attested as a surname from c. 1300. Beggar's velvet was an old name for "dust bunnies." Proverbial beggers should be no choosers is in Heywood (1562).
beggar (v.) Look up beggar at Dictionary.com
"reduce to poverty," mid-15c., from beggar (n.). From c. 1600 as "exceed the means of," hence "to outdo." Related: Beggared; beggaring.