The article discusses basic issues related to Polish anthroponomastic terms, their development and frequency, taking into account the variability of terminological units and the co-existence of native and foreign forms (usually Greek or Latin). It presents problems related to defining a term, determining its scope or (in particular cases) status, indicating preferred, permissible or non-recommended variant forms, selection (reduction) of sub-terms, the existence of doublets with a grammatical number, acceptance or rejection of new terms, etc. In the text, among others, the following sources were used: the dictionary “Osnoven sistem i terminologija na slovenskata onomastika” [“Basic system and terminology of Slavic onomastics”] (1983), an article by Mieczysław Karaś “W sprawie polskiej terminologii onomastycznej” [“On Polish onomastic terminology”] (1968), studies by Henryk Górnowicz (1988) and Ewa Jakus-Borkowa (1987), encyclopedia “Polskie nazwy własne” [“Polish proper names”] (1998), the compendium “Słowiańska onomastyka” [“Slavic onomastics”] (2002–2003) and selected articles published in the journal “Onomastica”. The second part of the article presents the history, scope and definitions of the term ethnonym // ethnic name (based on selected compendia, monographs and contributory studies), paying attention to the types of names it covers. In addition, a preliminary structure of an entry in the terminological dictionary has been outlined, including such elements as: the term, its definition, variability // equivalent term, origin // explanation, its English equivalent, examples // usage, context of use, and additional aspects.