By making a quick Google search in Dutch, I could find three different theories:
1. A direct derivation from the Roman name.
2. A variant of Knox.
3. A short form of Lennox, which seems plausible, since Lennox has somewhat risen in popularity in modern times.
Sources:
1.
-
https://www.zwangerenportaal.nl/15-korte-jongensnamen-babynamen-
https://www.24baby.nl/babynamen/nox
2.
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https://www.babybytes.nl/namen/meisjes/Nox
3.
-
https://www.babynamen.nl/naam/nox/-
https://nvb.meertens.knaw.nl/naam/is/Lennox
Unfortunately, the Nederlandse Voornamenbank doesn't provide the meaning of Nox, so I had to get the theories from baby name websites.
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