Updated June 9, 2019 Share: Family name origins & meanings English : occupational name meaning ‘servant of Gay’.French : from a Germanic personal name Gaidman or Gaidmar, of which the first element is gaida ‘point (of a lance)’.German (Gaymann) : variant of Gau 1, reinforced by the addition of man ‘man’.Americanized spelling of German Gehmann (see Gehman).