Where does “tretivu” come from?

tretivu (Faroese) comes from Danish tredive, from Old Danish thretiughæ, from Old Norse þrír, from Proto-Norse ᚦᚱᛁᛃᛟᛉ, from Proto-Germanic þrīz, from Proto-Indo-European *tréyes.

tretivu (Faroese): thirty

Definitions

thirty

Ancestry of “tretivu”, step by step

Step	Language	Word	Meaning
1	Danish	tredive	thirty
2	Old Danish	thretiughæ	thirty
3	Old Norse	þrír	three
4	Proto-Norse	ᚦᚱᛁᛃᛟᛉ	three
5	Proto-Germanic	þrīz	three
6	Proto-Indo-European	*tréyes	—

Every word from Proto-Indo-European *tréyes →Every word from Proto-Germanic þrīz →Every word from Proto-Norse ᚦᚱᛁᛃᛟᛉ →