Cognomen Hoorntje (Hoorntje 
) , all around the world, is a very rare last name. The family name Hoorntje is habitual in Netherlands, where it is a rare surname, Canada, where it is a very rare surname, and the United Kingdom, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Hoorntje | Canada, United Kingdom, Netherlands |
| jan cornelis anthony hoorntje NL (b. 1950) |
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| alexander hoorntje researcher |
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| edgar t hoorntje researcher (ORCID 0000-0002-8326-7717) |
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