1) The common aspen, a member of the poplar family, frequently found as the first element in minor place-names.
1288 le Aspehirste, Ilkley
n.d. Aspegate, Beamsley
1382 Asspeker, Worsbrough. ‘Aspen’ is now the usual word for the tree and it probably derived from the adjectival ‘aspen’: it also occurs as a place-name element and is in the northern surname Aspinall.