Hi I've made this tweaks for myself regarding south slavic names:
1. Karantanci:
male_names = {
Aleš Alojz Andreas_Andrew Adrian_Adrian Andrej_Andrew Anton_Antoninus Adam_Adam Aleksandar_Alexander Avgust Božidar_Theodore Bartolomej_Bartolomeus Blaž_Blaise Bogdan Bogomir Bojan Borut Boštjan Branislav Dejan Davor Domislav Domicijan Etgar Edvard_Edward Ernest_Ernest Franc_Francis Fran_Francis Gašpar Gregor_Gregory Gorazd Gojmir Hotimir Ivan_John Ivo_John Istok Ignacij_Ignatius Jakob_Jacob Nikola_Nicholas Ognjen Vuk_Lupo Janez Janko Jernej Josip_Joseph Jozef_Joseph Julij_Julian Jure Jurij Jaroslav Krištof_Christopher Karel_Charles Lovro Ludovik Lenard Ljudevit Lovro Marin Marko_Marcus Matjaž_Matthew Matevž_Matthew Mihael_Michael Milan Miha_Michael Miroslav Oton Pavel_Paul Peter_Peter Perun Pribislav Primož Rene Rihard_Richard David_David Grgur_Gregory Robert Samo Semik Stane Stefan_Stephen Stanislav Stojmir Tomaž_Thomas Valtunk Valuk Vitomil Vid Viktor_Victor Viljem_William Vladimir Volk Vonko Vladislav Vitomir Venceslav Vekoslav Višeslav Valentin Zdeslav
female_names = {
Agata Albina Alena Alenka Alojzija Amalija Ana Andrea Antonia Apolonia Avrelia Bojana Brigita Cecilija
Danica Daniela Daria Dorotea Draga Dragica Dunja Dubravka Edita Elizabeta Emilia Erika Franciska Gertruda Gregoria Irena Ivana
Jana Jasa Jelka Jera Johana Jolanda Jozefa Jozefina Julija Julijana Justina Karolina Katarina Katja Klaudia Kristina Ksenija
Ljubica Ljudmila Lucia Maja Majda Mara Maria Marta Martina Matea Melita Olivera
Metka Mila Milena Natalia Nataša Nina Olga Pavla Petra Renata Roza Rozalia Silvia
Sabina Slava Špela Stefana Tanja Terezija Ursa Ursala Vedrana Velana Vera Veronika Vida Vesna Zedenka
2. Croatian
male_names = {
Adam_Adam Andrija_Andrew Ante_Antoninus Antun_Antoninus Blaž_Blaise Borna Braslav Bartol_Bartolomeus Bojan Boris Branimir Castimir Danilo_Daniel Dmitar_Demetrius Dobromir Dragan Dragomir Držislav Dujam Domagoj Davor Dubravko Franjo_Francis Filip_Philip Gašpar Goran Gojislav Djordje_George Grgur_Gregory Hranislav Hrvoje Ivan_John Ivaniš_John Iljko Jug Jadranko_Adrian Jaroslav Juraj Jure Jitej Josif_Joseph Josip_Joseph Karlo_Charles Koloman_Koloman Krešimir Ladislav Ljudevit Ljutomisl Lovro Luka Marko_Marcus Martin_Martin Matej_Matthew Mihajlo_Michael Milman Mislav_Miroslav Muncimir Matko_Matthew Nikola_Nicholas Ninoslav Ognjen Pavao_Paul Petar_Peter Prohor Radoslav Radomir Ratimir Svetoslav Sebeslav Slaven Stanislav_Stanislav Stjepan_Stephen Teodor_Theodore Tomislav_Thomas Tihomir Tvrdoslav Trpimir Ulfo_Ulf Vid Vitomir
Miroslav Vjekoslav Vojnomir Višeslav Zdeslav Želimir Zvonimir Zdenko David_David
female_names = {
Adriana Ana_Anna Adela Aleksandra Borislava Buga Dorotea_Dorothy Ekaterina_Catherine Helena_Helen Jadviga Ladika Maria_Maria Mihaela Nada Petra Viola_Yolanda Jadranka Mara Antonija Dragana Dubravka Ivana Irena Mirjana Emilija_Emily Gordana Julijana Josipa Jagoda Jelena Jelka Lucija_Lucia Katalina_Catherine Marija_Maria Marijana Mirjana Mirna Natalija Nataša Rijeka Renata Olivera Silvija Snježana Sofija_Sophia Suzana_Susana Svjetlana Tatjana Tihana Tuga Vesna Valerija Vedrana Višnja Vjekoslava Zlata Zvonimira Zdenka
3. Serbian
male_names = {
Andrija_Andrew Balša_Blaise Boško Bojan Beloš Branislav Branko Bran Bogdan Bodin Branimir Budimir Caslav Draško Dejan Desa Dimitrije_Demetrius Dušan Dragoslav Danilo_Daniel Dobroslav Dragoš Dragutin Dražen Goran Gojko Grgur_Gregory Grubeša Djordje_George Djuradj_George Hrelja Hvalimir Ilija Ivaniš_John Jakša Jagoš Jovan_John Jakov_Jacob Jug Konstantin_Constantine Lazar Miloš_Milosz Mladen Mutimir Marko_Marcus Matija_Matthew Mihailo_Michael Milutin Miroslav_Miroslav Nemanja Nebojša Novak Nenad Nikola_Nicholas Ognjen Oliver Pavle_Paul Pribislav Predislav Predrag Petar_Peter Prvoslav Radoš Radoslav Radonja Rastko Ratomir Sava Stracimir Strahinja Simeon_Simon Siniša Staniša Stefan_Stephen Tihomir Toljen Uglješa Uroš Vladimir_Vladimir Vladislav_Vladislav Vlastimir Vid Vuk_Lupo Vukan_Lupo Vukašin_Lupo Vukoman_Lupo Vukoslav_Lupo Višeslav Vojislav Vratko Vlatko Vojin Vujadin Zaharije_Zacharias Zoran Žarko
female_names = {
Ana Anastasija Angelina Andjelija Antonija Branimira Biljana Bojana Bogdana Branislava Dubravka Dobroslava Dejana Dragana Dragoslava Dušica Dušana Danica Elena_Helen Gordana Grana Grubana Irina Jadranka Jefimija Jelisaveta Jevdokija Jagoda Jovana Jelisanta Jelena_Helen Karolina Katarina Komnina Ksenija Mara Ljubica Ljiljana Marija_Maria Milena Milica Miroslava Malina Milinka Miljana Mirjana Nada Nataša Natalija Neda Nikolina Olivera Ognjenka Predislava Prvoslava Radoslava Rudjina Simonida Snežana Suzana Stefania Svetlana Teodora Vesna Vukoslava Vojislava Vuka Višeslava Vladislava Vladana Zora Zdenka Zorica
4. Bosnian
male_names = {
Dabiša Crijep Vlatko Vuk_Lupo Vukša_Lupo Vukmir_Lupo Tomaš_Thomas Andrijaš_Andrew Boško Bojan Beloš Branislav Branko Bran Bogdan Branimir Budimir Draško Dražen Dejan Desa Dimitrije_Demetrius Dragoslav Danilo_Daniel Djordje_George Dmitar Dobroslav Dragoš Goran Višeslav Vojislav Raden Radovan Prijezda Ostoja Budislav Matej_Matthew Nikola_Nicholas Grgur_Gregory Grubeša Grdeša Djordje_George Djuradj_George Hvalimir Ilija Ivaniš_John Jovan_John Jug Kulin Konstantin_Constantine Lazar Ljudevit Ljutovid Miloš_Milosz Mladen Mutimir Marko_Marcus Mihailo_Michael Miroslav_Miroslav Nebojša Novak Nenad Tvrtko Stjepan_Stephen Ninoslav Ognjen Oliver Pavle_Paul Pribislav Predislav Petar_Peter Prvoslav Radoslav Ratomir Radomir Stracimir Strahinja Tihomir Toljen Vladimir_Vladimir Vladislav_Vladislav Vlastimir
female_names = {
Ana Anastasija Angelina Branimira Dubravka Elena_Helen Jelena Karolina Marija_Maria Neda Zdenka Vesna Snežana Suzana Andjelija Antonija
Biljana Bojana Bogdana Branislava Dobroslava Dejana Dragana Dragoslava Dušica Dušana Gordana Grana Grubana Irina Jadranka Jefimija Jelisaveta Jevdokija Jagoda Jovana Katarina Komnina Mara Ljubica Milena Milica Miroslava Olivera Radoslava Simonida Teodora Vukoslava Vojislava Vuka Višelsava Malina Milinka Miljana Mirjana Nada
Maybe its not perfect, but its definitely better than original list
