Where does “Dolgu” come from?

Dolgu (Romanian) comes from Old Church Slavonic дльгъ, from Proto-Slavic dь̀lgъ, from Proto-Balto-Slavic dílˀgas, from Proto-Indo-European dl̥h₁gʰós — long.

Ancestry of “Dolgu”, step by step

Step	Language	Word	Meaning
1	Old Church Slavonic	дльгъ	long
2	Proto-Slavic	dь̀lgъ	long
3	Proto-Balto-Slavic	dílˀgas	long
4	Proto-Indo-European	dl̥h₁gʰós	long

Every word from Proto-Indo-European dl̥h₁gʰós →Every word from Proto-Balto-Slavic dílˀgas →Every word from Proto-Slavic dь̀lgъ →