Geysen or Geijsen is a Dutch patronymic surname meaning "Gijs' son".Geijsen (y) at the Database of Surnames in The Netherlands. Notable people with the surname include:

Bettina Geysen (born 1969), Belgian politician Frans Geysen (born 1936), Belgian composer and writer on music Willy Geysen (born 1940s), Belgian engineer Variants: Carry Geijssen (born 1947), Dutch speed skater Chris Gheysens (born 1971), American business executive

See also Geysen Glacier, Antarctic glacier named after Hendrick Geysen Gijsen, surname of the same origin Oliver Geissen (born 1969), German television presenter

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