Where does “Mazowsze” come from?

Mazowsze (Polish) comes from Polish maź, from Proto-Slavic mazь, from Proto-Slavic -ь, from Proto-Indo-European -is — Forms nouns from verbs.

Ancestry of “Mazowsze”, step by step

StepLanguageWordMeaning
1Polishmaźslime, grease
2Proto-Slavicmazьgrease, ointment
3Proto-Slavic-ьForms nouns; From adjectives; From participles
4Proto-Indo-European-isForms nouns from verbs

Words derived from “Mazowsze”

Every word from Proto-Indo-European -is →Every word from Proto-Slavic -ь →Every word from Proto-Slavic mazь →