The name Æscwulf appears from the early eighth century onwards but was never very common and is not at present on record between the 970s and 1066 (PASE: Æscwulf 1–3, 5–9). It was formed from the OE words æsc ‘spear, lance’ or ‘ship’ and wulf ‘wolf’, the latter extremely common as a name-element, the former rather rarer, especially among landowners TRE (von Feilitzen 1937: 182).
von Feilitzen 1937: Olof von Feilitzen, The Pre-Conquest Personal Names of Domesday Book, Nomina Germanica 3 (Uppsala: Almqvist and Wiksells, 1937)
Spellings in Domesday Book: Essul
Forms in modern scholarship:
von Feilitzen head forms: Æscwulf
Phillimore edition: Aescwulf
Alecto edition: Æscwulf