I thought Taurik became Vorik for the exact same reason that Locarno became Paris: for the royalty issue you mentioned.
Both Taurik and Vorik were introduced in episodes whose stories were by Ron Wilkerson & Jean Louise Matthias, so I believe the same royalties would apply regardless. My understanding (though Memory Alpha doesn't verify this) is that the only reason they changed his name is because someone felt "Taurik" sounded too similar to "Tuvok." (I would've thought it was because it sounded too similar to "Torres," but apparently not.) Ironically, the character was originally named Sorik, but it was changed to Taurik specifically in order to emulate Tuvok's naming pattern.