Where does “Lubin” come from?

Lubin (Lower Sorbian) comes from Proto-Slavic -inъ, from Proto-Indo-European -iHnos, from Proto-Indo-European -no- — adjectival suffix.

Ancestry of “Lubin”, step by step

StepLanguageWordMeaning
1Proto-Slavic-inъ-ine; Creates singulatives, mostly with...
2Proto-Indo-European-iHnosCreates adjectives of materials
3Proto-Indo-European-no-adjectival suffix
Every word from Proto-Indo-European -no- →Every word from Proto-Indo-European -iHnos →Every word from Proto-Slavic -inъ →