Where does “Simek” come from?

Simek (English) comes from Czech Šimek, from Czech -ek, from Old Czech -ek.

Ancestry of “Simek”, step by step

Step	Language	Word	Meaning
1	Czech	Šimek	—
2	Czech	-ek	forms masculine diminutive nouns
3	Old Czech	-ek	—

Simek — Etymology, Origin & Word History | Etymology Explorer