Where does “vulkanøy” come from?

vulkanøy (Norwegian Bokmål) comes from Norwegian Bokmål øy, from Old Norse ey, from Proto-Norse *ᚨᚢᛃᚢ, from Proto-Germanic awjō, from Proto-Germanic agwjō, from Proto-Indo-European h₂ékʷeh₂ — water.

vulkanøy (Norwegian Bokmål): a volcanic island

Definitions

a volcanic island

Ancestry of “vulkanøy”, step by step

vulkanøy traces back through two separate lines of ancestry.

via Norwegian Bokmål øy

Step	Language	Word	Meaning
1	Norwegian Bokmål	øy	an island
2	Old Norse	ey	always, ever; island
3	Proto-Norse	*ᚨᚢᛃᚢ	—
4	Proto-Germanic	awjō	floodplain; meadow; island
5	Proto-Germanic	agwjō	—
6	Proto-Indo-European	h₂ékʷeh₂	water

via Norwegian Bokmål vulkan

Step	Language	Word	Meaning
1	Norwegian Bokmål	vulkan	a volcano
2	Latin	Vulcānus	Vulcan, the Roman god of fire and metalwork, considered equivalent to the Greek Hephaestus and various German and Celtic gods
3	Ancient Greek	ὀδών	Ionic form of ὀδούς

Every word from Proto-Indo-European h₂ékʷeh₂ →Every word from Proto-Germanic agwjō →Every word from Proto-Germanic awjō →