Family name Willenborg (Willenborg 
) , in the world, is quite a rare last name. The cognomen Willenborg is characteristic of Germany, where it is quite a rare surname, Netherlands, where it is a rare surname, and the United States.
| VARIANT | COUNTRY |
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| Willenborg | Brazil, Germany, Netherlands, United States, Australia |
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frank willenborg German football referee, DE (b. 1979) |
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| karl-heinz willenborg (b. 1944) |
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| blaine willenborg American tennis player, US (b. 1960) |
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| chuck willenborg American tennis player (b. 1964) |
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| christian j willenborg researcher ORCID ID = 0000-0001-9733-2252 |
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| michael willenborg academic |
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| leon c. r. j. willenborg Ph.D. Tilburg University 1988 |
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| dave willenborg college basketball player (1969–1971) Washington |
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| christina willenborg researcher |
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| franz august willenborg DE |
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