Although his father used the surname Barkhof, Jan (* Zijen (?) 1763 - +1846) and his des-cendants were known under the name Berkhof. In the
eighteenth century, the surnames Berkhof and Barkhof were used on the sandy soils of the north-east of The Netherlands as synonymous. Possibly
this was of influence during the introduction of the Registration Service in 1811, when the spelling of surnames became fixed. Descendants are espe-
cially found Zijen-Vries (Berkhof and Barkhof), Zweelo-Emmen (Berkhof), Anloo-Assen-Norg (Barkhof).