Where does “trygda” come from?

trygda (Norwegian Nynorsk) comes from Norwegian Nynorsk trygd, from Old Norse trygð, from Proto-Germanic triwwiþō, from Proto-Indo-European dóru, from Proto-Indo-European drew- — hard, firm, strong, solid; hard, fast; tree.

Ancestry of “trygda”, step by step

StepLanguageWordMeaning
1Norwegian Nynorsktrygdinsurance (social security, national health etc.)
2Old Norsetrygð—
3Proto-Germanictriwwiþōpromise, contract
4Proto-Indo-Europeandórutree
5Proto-Indo-Europeandrew-hard, firm, strong, solid; hard, fast; tree
Every word from Proto-Indo-European drew- →Every word from Proto-Indo-European dóru →Every word from Proto-Germanic triwwiþō →