Hieronim is a derivative (Polish) of the German and Scandinavian name Harald.
Hieronim is also a derivative (Polish) of the English and French name Jerome.
Hieronim is seldom used as a baby name for boys. It is not in the top 1000 names. Within the group of boy names directly related to Hieronim, Jerome was the most frequently used in 2018.
Baby names that sound like Hieronim include Hariane, Harim, Harina, Hariom, Harmonee, Harmoney, Harmoni, Harmony, Haruna, Haruni, Harunie, Heremon, Hermano, Hermino, Hermínio, Heromin, Hierome, Hiranmae, Hiranmai, and Hiranmay.
† English pronunciation for Hieronim: HH as in "he (HH.IY)" ; IH as in "it (IH.T)" ; R as in "race (R.EY.S)" ; OW as in "oak (OW.K)" ; N as in "knee (N.IY)" ; IY as in "eat (IY.T)" ; M as in "me (M.IY)"