Helena Nordheim (1903–1943), Olympic champion gymnast (team combined exercises)
Simon Okker (1881–1944), Olympic fencer killed in Auschwitz
Tom Okker (born 1944), tennis player, won 1973 French Open Men's Doubles (w/John Newcombe), 1976 US Open Men's Doubles (w/Marty Riessen), highest world ranking # 3 in singles, and # 1 in doubles
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