Sæmann is a masculine Old English name formed from the common elements sæ (‘sea’) and mann (‘man’) and identical in form with the common noun meaning ‘seaman’ or ‘pirate’. The second element is a feature of later Old English name-giving, and the handful of pre-Conquest examples of the name all date from after 1000 (Sæmann 1–3).
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: Seman
Forms in modern scholarship:
von Feilitzen head forms: Sæmann
Phillimore edition: Saeman
Alecto edition: Sæmann