As von Feilitzen pointed out (1937: 222), the Domesday spelling Dainz is likely to represent Daing, an Old English form of the final –g having been misread by a Norman scribe as a –z, a mistake which is found elsewhere in DB (von Feilitzen 1937: 87 § 83). Daing is the OE masculine name Dæging, formed from the first element dæg ‘day’ and the name-forming suffix –ing. Although the name Dæging is not otherwise on record, and the element dæg appears in the OE personal names of DB only as a second element, Dæg– was quite prolific as a first element in names. Most people recorded in PASE whose names started with Dæg– lived before 900, but the element was evidently brought back into use in certain sections of society after c. 1000: a moneyer at Maldon (Essex), active 1042–53, was called Dægniht (‘day-night’), and a man called Dægfinn received a bequest of a gold mark from a Hertfordshire thegn c. 1050 (S 1532). Other late OE names in Dæg– also seems to lie behind the later surnames Daylove and Daymar (Reaney 1997: 128).
Reaney 1997: P. H. Reaney, A Dictionary of English Surnames, 3rd edn with corrections and additions by R. M. Wilson (Oxford: Oxford University Press, 1997)
S: P. H. Sawyer, Anglo-Saxon Charters: An Annotated List and Bibliography, Royal Historical Society Guides and Handbooks 8 (London, 1968), revised by S. Kelly, R. Rushforth et al., The Electronic Sawyer: Online Catalogue of Anglo-Saxon Charters, published online through Kemble: The Anglo-Saxon Charters Website, currently at http://www.esawyer.org.uk/about/index.html
Spellings in Domesday Book: Dainz
Forms in modern scholarship:
von Feilitzen head forms:
Phillimore edition: Daeging
Alecto edition: Dainz