Willem Jacob van der Kaaij
- Born: 1868, Brouwershaven, , Zeeland, Netherlands
- Marriage (1): Hermina Francisca Maria Lippits on 15 Oct 1925 in Haarlem, , Noord-Holland, Netherlands
 Noted events in his life were:
• Occupation: Architect.
Willem married Hermina Francisca Maria Lippits, daughter of Herman Cornelis Lippits and Francisca Elisabeth Sautarel, on 15 Oct 1925 in Haarlem, , Noord-Holland, Netherlands. (Hermina Francisca Maria Lippits was born in 1887 in Haarlem, , Noord-Holland, Netherlands.)
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