α. Middle English wirling, Middle English wirlyng, Middle English wyrlynge, Middle English–1500s wyrling, 1500s–1600s worling; Scottish pre-1700 wirling, pre-1700 worlin, pre-1700 worling, 1800s wirlin, 1800s wurlin, 1800s wurlyon; N.E.D. (1926) also records a form late Middle English wyrlyng.
β. English regional (northern) 1600s 1800s urling, 1700s orling, 1800s urpling, 1800s urlin; Scottish 1800s orlin, 1800s orling, 1800s urlin, 1800s yurlin.