Where does “-jar” come from?

-jar (Serbo-Croatian) comes from Proto-Slavic -ařь, from Gothic -𐌰𐍂𐌴𐌹𐍃, from Proto-Germanic -ārijaz, from Latin -ārius, from Proto-Italic *-āzios — Forms relational adjectives to nouns (and rarely numerals).

Ancestry of “-jar”, step by step

StepLanguageWordMeaning
1Proto-Slavic-ařь-er
2Gothic-𐌰𐍂𐌴𐌹𐍃-er
3Proto-Germanic-ārijaz-er
4Latin-āriuser
5Proto-Italic*-āziosForms relational adjectives to nouns (and rarely numerals)
Every word from Proto-Italic *-āzios →Every word from Latin -ārius →Every word from Proto-Germanic -ārijaz →