garret (n.)
c.1300, "turret, small tower on the roof of a house or castle," from Old French garite "watchtower, place of refuge," from garir "defend, preserve," from a Germanic source (compare Gothic warjan "forbid," Old High German warjan "to defend"), from Proto-Germanic *warjan, from PIE root *wer- (5) "to cover" (see warrant (n.)). Meaning "room on uppermost floor of a house" is from early 14c. See attic. As the typical wretched abode of a poor poet, by mid-18c.