Keijzer is a Dutch surname meaning "emperor" (modern Dutch ''keizer''). The name contains a ij digraph that is often replaced with a "y", especially outside the Netherlands. Among variant forms of the surname are ''Keijser'', ''Keijsers'', ''Keijzers'', Keizer, Keyser, ''De Keijzer'', De Keyser, and ''De Keyzer''. People with this name include:
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