Where does “द्वारका” come from?

द्वारका (Hindi) comes from Sanskrit द्वारका, from Sanskrit द्वार, from Proto-Indo-Aryan dwā́ram, from Proto-Indo-Iranian dʰwā́ram, from Proto-Indo-European dʰwórom, from Proto-Indo-European dʰwor-, from Proto-Indo-European dʰwer- — door.

Ancestry of “द्वारका”, step by step

StepLanguageWordMeaning
1Sanskritद्वारकाCity ruled by Krishna (located on the western point of Gujarat, supposed to have been submerged by the sea) &c
2Sanskritद्वारdoor, gate, passage, entrance; opening, aperture;...
3Proto-Indo-Aryandwā́ram
4Proto-Indo-Iraniandʰwā́ram
5Proto-Indo-Europeandʰwórom
6Proto-Indo-Europeandʰwor-door, gate; doorway, door, gate
7Proto-Indo-Europeandʰwer-door
Every word from Proto-Indo-European dʰwer-Every word from Proto-Indo-European dʰwor-Every word from Proto-Indo-European dʰwórom