A fast or furious driver; a driver, coachman.
Jehu, son of Nimshi, was the king of Israel in the nineth century BCE (or BC if you're into that sort of thing), and was noted to be a bit of a reckless driver. This was noted in the Bible, specifically II Kings IX, xx: 2 Kings ix. 20 ‘the driving is like the driving of Jehu the son of Nimshi, for he driveth furiously.’
1759 Goldsm. Bee No. 5 (Reverie): He assured the Coach~man that his baggage was perfectly light. But Jehu was inflexible.
The Israeli prince wasn't the only one in history to get a bit of a name as a jehu on the roads; Phaeton, son of Helios, was given the job of pulling the sun along just for one day and cocked it up! On the plus side, Jehu didn't have to be killed by Zeus to stop endangering the world as we know it!