Where does “Tryggvína” come from?

Tryggvína (Icelandic) comes from Icelandic Tryggvi, from Old Norse tryggvi, from Old Norse tryggr, from Proto-Germanic triwwiz, from Proto-Indo-European drew-, from Proto-Indo-European dóru, from Proto-Indo-European deru- — firm, solid; wood; be firm, hard, solid.

Ancestry of “Tryggvína”, step by step

StepLanguageWordMeaning
1IcelandicTryggvi
2Old Norsetryggviweak masculine nominative singular of tryggr;...
3Old Norsetryggrtrue
4Proto-Germanictriwwiztrue; faithful
5Proto-Indo-Europeandrew-hard, firm, strong, solid; hard, fast; tree
6Proto-Indo-Europeandórutree
7Proto-Indo-Europeanderu-firm, solid; wood; be firm, hard, solid
Every word from Proto-Indo-European deru-Every word from Proto-Indo-European drew-Every word from Proto-Indo-European dóru