I have been looking in to my family history and have traced the family back to Vis/Lissa. The surname and ethnicity is to my understanding Croatian (the ić ending is the give away I believe) but almost all the records I'm finding have Italian sounding personal names. Were the names entered in an Italian form (the birth, marriage etc records are in the Italian language) or did ethnic Croatians choose Italian names, Girolamo, Antonia, Vincenzo, Rocco, Lucia, etc at this time (the 19th Century)?
From 1420 to 1797 the Republic of Venice controlled nearly all of Dalmatia/croatia. They even called the southern bit (bay of kotor) "Albania Veneta". Venetian was the commercial "bridge language" (aka Lingua Franca) in the Mediterranean during venetian rule. Because of that, Venetian heavily influenced Dalmatian language and culture. Venetian also influenced Italian language and vice versa. So the Italian sounding names are likely rooted in the history and proximity with Venice/Italy.