Recorded in several forms including Hasler, Haseler, Haselar, Haeslar, Haeslier, and Heasler, this is an English locational surname of great antiquity. It originates from either a place called Haselore in the county of Staffordshire, or Haselor of which there are understood to be two villages, one in Warwickshire and the other in worcestershire. The place names mean the "area where the hazel trees grow", and the first village recording is that of Haselor in Warwickshire. This is recorded as Haselour in the famous Domesday Book of 1086. Locational surnames were usually from names. That is to say names given to people after they left their original homes to move elsewhere, although elsewhere could easily be the next village or town. In anycase the easiest method to identify a stranger was to call him or sometimes her, by the name of the place from whence they came. In this case the first known recording is believed to be that of Robert de Heselhour in the registers of the court of Warwickshire in the year 1221, and another Robert de Haselore, this time in the court rolls of Staffordshire in 1287