rover (n.)

late 14c., "sea-robber, pirate," from Middle Dutch rover "robber, predator, plunderer," especially in zeerovere "pirate," literally "sea-robber," from roven "to rob," from Middle Dutch roof "spoil, plunder," related to Old English reaf "spoil, plunder," reafian "to reave" (see reave (v.)). Meaning "remote-controlled surface vehicle" is from 1970.