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# Ulrik (30 December 1578 – 27 March 1624 in Rühn), last Bishop of the old Schleswig see (1602–1624), and as Ulrich II Administrator of the Prince-Bishopric of Schwerin (1603–1624), married Lady Catherine Hahn-Hinrichshagen
The Keyserlingks have family relations with Barrett, von Below, von Bogen, Bordehl von Bordelius, von Braun, von der Brueggen, von Dehn, Finck von Finckenstein, von Grotthuss, von Hahn, Hillis, von Kleist, von Lieven, von der Pahlen, Perkins, Popp, von Quistorp, von Rahden, von der Recke, von Roenne, von der Ropp, Ruggels, Schick, Schirinski Schikhmatoff, Spano, Sponholtz, Thurn und Taxis, Turcot, Wadenstierna and Wilson.
# Ulrik (30 December 1578 – 27 March 1624 in Rühn), last Bishop of the old Schleswig see (1602–1624), and as Ulrich II Lutheran Administrator of the Prince-Bishopric of Schwerin (1603–1624), married with Lady Catherine Hahn-Hinrichshagen
As Administrator of the Prince-Bishopric of Schwerin he was succeeded by his grandson the last Bishop of Schleswig, Prince Ulrich of Denmark (30 December 1578 – 27 March 1624 in Rühn), who married with Lady Catherine Hahn-Hinrichshagen.
Peter von Hahn (1799–1875), member of the Russian nobility, remembered in the United States mainly as the father of Helena Blavatsky.