"light carriage with four wheels and seats for two," 1773, of unknown origin. OED finds no grounds for derivation from Hindi bagghi "a gig" or another Anglo-Indian source. Extended to baby carriages by 1884.
buggy (adj.)
"infested with bugs," 1714, from bug (n.) + -y (2).
bugaboo
bugbear
bug-bite
bugger
buggery
buggy
bughouse
bugle
bugler
bugloss
build