As an Italian citizen, I would like to offer some suggestions when selecting names which should sound likely, also according to some basic things of Italian names and surnames which, of course, I'm probably more aware of.
The most typical and spread Italian family names are those with colours. Bianchi, Rossi, Verdi, etc (white, red, green). Giallo, Arancione, Blu are not found (yellow, orange, blue), while even if rare you can find some Marrone (brown). Viola (purple) is not uncommon in the South.
Most Italian family names end in -i. But this is something which, originally, was mostly spread in the North of Italy. If you are thinking Borca as Italian Renaissance, you really should think about Northern and Central Italy, since in the South there was a Kingdom often under the rule of Spanish, French, Arabs, according to several different periods of history. Northern and Central Italy can still have some surnames ending with other vowels. But they always end in vowel anyway.
De, Di as preposition, means of. Sometimes it is originated by the first name of a founder of a family. You can use an apostrophe, thus D', but normally it happens only if the following word begins with another vowel: it can happen there is a consonant, but then the following name should be plural: the plurals in Italian are mostly in -i (masculine) and -e (feminine).
Sometimes Italian names and surnames have a digraph, -gl- or -gn- which actually are sound not existing in English (it is more or less as the Spanish word pollo, the first, and Espana [with the tilde] for the second). Che and Chi are read Ke and Ki; Ce and Ci are read Che and Chi; Qu- normally is Ku- (plus another vowel).
Some Italian surnames have origin in some town or city, they are normally related to the Jewish community who, in the past, changed their own surname to "thank" the places which welcomed them.
Italian typical first names more or less are mostly originated from Latin or Ancient Greek, there are only a few coming from other languages. In my view I do believe they should be used more for a Darkonian than a Borcan.
Yes, this is another point I would like to stress. Even though Borca is clearly inspired to Renaissance Italy, the language is not, and thus not even the names should be. As far as I know it would be preferable to use first and family names related to Serbo-Croatian language. Ivan, Ivana, Boris are not your typical Italian name. Boritsi or Dilisnya is not either. You don't find easily the following letters in Italian: w, y, x, k. You can find some "j" here and there in names.
Given the setting origin of Borca it'd be, in my view, more advisable to use names which are of Barovian (Balok) or High Mordentish origin, because the other names I see normally sound, at least to me, more related to Darkon than Borca itself.
I am ready for any feedback or other information if needed.
