Title count of active WTA players. Minimum 2 titles, GS's in parenthesis if any. Current top 10 players in bold.
Petra Kvitova 29 (2)
Simona Halep 24 (2)
Victoria Azarenka 21 (2)
Karolína Plíšková 16
Iga Świątek 12 (3)
Aryna Sabalenka 12 (1)
Caroline Garcia 11
Garbiñe Muguruza 10 (2)
Sara Errani 9
Belinda Bencic 8
Sloane Stephens 7 (1)
Elise Mertens 7
Madison Keys,
Daria Kasatkina, Anett Kontaveit, Alizé Cornet 6
Barbora Krejčíková 5 (1)
Jeļena Ostapenko 5 (1)
Sofia Kenin 5 (1)
Irina-Camelia Begu 5
Ludmilla Samsonova, Kaia Kanepi, Lesia Tsurenko, Heather Watson, Mona Barthel 4
Elena Rybakina 3 (1)
Bianca Andreescu 3 (1)
Ons Jabeur,
Coco Gauff, Paula Badosa, Ekaterina Alexandrova, Shuai Zhang, Donna Vekić, Kateřina Siniaková, Alison Riske, Camila Giorgi, Anna Karolína Schmiedlová, Dayana Yastremska 3
Jessica Pegula, Beatriz Haddad Maia, Magda Linette, Petra Martić, Anastasia Potapova, Leylah Fernandez, Amanda Anisimova, Jil Teichmann, Danielle Collins, Yulia Putintseva, Lauren Davis, Sorana Cîrstea, Tatjana Maria, Laura Siegemund, Clara Tauson, Nao Hibino 2
So to summarize there are 54 multi title winners on tour. 13 GS winners, from those 5 with more than one.
To be updated after this week and maybe in the future too.