boat (n.) Look up boat at Dictionary.com
Old English bat "boat, ship, vessel," from Proto-Germanic *bait- (source also of Old Norse batr, Dutch boot, German Boot), possibly *bheid- "to split," if the notion is of making a boat by hollowing out a tree trunk or from split planking; or it may be an extension of the name for some part of a ship. French bateau "boat" is from Old English or Norse. Spanish batel, Italian battello, Medieval Latin batellus likewise probably are from Germanic.