Rokus

Like I said in a previous comment, Rokus is not an exclusively Frisian name: it is also a Dutch name. At least in the case of the Dutch, Rokus is a variant spelling of Rocus, which itself is a variant form of Rochus. Funnily enough, Rokus is more common in the Netherlands than the original that it was based on (namely, Rocus). Just compare their overall popularities here:

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- Rocus: http://www.meertens.knaw.nl/nvb/naam/is/Rocus (in Dutch)

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- Rokus: http://www.meertens.knaw.nl/nvb/naam/is/Rokus (in Dutch)

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Also, in Dutch, Rokus is pronounced as: RO-kus. [noted -ed]

Rokus is actually a variant spelling/form of Rochus, one that has been used both in Dutch and Frisian. It is not an exclusively Frisian name.