1) A common local spelling of alder.
1572 at the north end of the dame begynnyng at one owlar bushe, Honley
1592 That no person pill anie owlers, crabtries or hollyns, Dewsbury
1690 a close called Owlers, Almondbury. In the late sixteenth century, the Kayes of Woodsome brought water in Owler troughs to the Brewhouse. Smith indexes numerous minor place-names such as Owler Greave, Owler Wood, Owlers Wood, Green Owlers.