Vrelo koje analiziraju autori jedan je od najstarijih u cijelosti sačuvanih registara crkvene desetine s područja Zagrebačke biskupije. Taj dosad neobjavljeni dokument sadrži nekoliko tisuća osobnoimenskih potvrda koje su detaljno analizirane u skladu s precizno oblikovanom metodologijom istraživanja. Uz analizu osobnih imena po podrijetlu i tvorbi, autori donose i potvrde neuobičajenih te rijetkih osobnih imena.Tithe registries are valuable onomastic sources as they abound in attestations of first names. The tithe registry of Gorica district from 1464 is one of the oldest church tithe registries in Croatia. It is also one of the largest tithe registries given that it contains more than 2000 first names from almost 80 villages. It contains names of judges, judicial clerks, landholders and foreigners. The registry was handwritten in Latin and has not been studied or published in print yet. In the 15th century the historical Gorica church tithe district was situated in Slavonia, the central part of the medieval Kingdom of Croatia. The area was very densly populated until the commencement of Ottoman incursions, when massive waves of migrants started emigrating towards the northwest. This paper gives an onomastic analysis of first names in the tithe registry of Gorica district. The inventory of first names is analyzed from etymological, typological and historiographical point of view. First names are classified according to their origin and formation. The main goal of this paper is to propose a significant contribution to the research of Croatian historical anthroponymy, and especially anthroponymy of the late Middle Ages. Our data is comparable to earlier analysis of historical sources, from different Croatian territories in the 15th century. In this respect this data acknowledges many similarities to other Croatian regions. Contrary to the traditional paradigm of European onomastics, according to which the middle of the 16th century represents a watershed moment (the Council of Trent) which greatly influenced the use of Christian first names and family names, the 1464 Gorica district registry is (another) historical source confirming that these processes started much earlier