Where does “Þorsteinína” come from?

Þorsteinína (Icelandic) comes from Icelandic Þorsteinn, from Old Norse Þorsteinn, from Old Norse Steinn, from Proto-Norse ᛊᛏᚨᛁᚾᚨᛉ, from Proto-Germanic stainaz, from Proto-Indo-European steyh₂-, from Proto-Indo-European steh₂- — to stand.

Ancestry of “Þorsteinína”, step by step

StepLanguageWordMeaning
1IcelandicÞorsteinn—
2Old NorseÞorsteinn—
3Old NorseSteinna stone, boulder, rock
4Proto-Norseᛊᛏᚨᛁᚾᚨᛉstone
5Proto-Germanicstainazstone
6Proto-Indo-Europeansteyh₂-to stiffen
7Proto-Indo-Europeansteh₂-to stand
Every word from Proto-Indo-European steh₂- →Every word from Proto-Indo-European steyh₂- →Every word from Proto-Germanic stainaz →