According to one theory, from English jolly boat. See also جَال (jāl, “shore”). IPA(key): /d͡ʒaːl.boːt/ جالبوت • (jālbōt) m a type of ship...
published 2009, page 139: When they reached the brig, they found that the jolly-boat had been lowered and laid alongside. >? Gulf Arabic: جالبوت (jālbōt)...