Where does “rorqual” come from?

rorqual (English) comes from Norwegian Nynorsk røyrkval, from Old Norse reyðarhvalr, from Old Norse reyðr, from Old Norse rauðr, from Old English dūn, from Proto-Germanic *dūnā, from Proto-Celtic dūnom, from Proto-Indo-European dʰewh₂- — smoke; mist, haze.

rorqual (English): Any whale of family Balaenopteridae, with...

Definitions

Any whale of family Balaenopteridae, with...

Ancestry of “rorqual”, step by step

Step	Language	Word	Meaning
1	Norwegian Nynorsk	røyrkval	fin whale
2	Old Norse	reyðarhvalr	rorqual whale
3	Old Norse	reyðr	rorqual, fin whale
4	Old Norse	rauðr	red
5	Old English	dūn	hill, down; hill, dune; hill, mountain
6	Proto-Germanic	*dūnā	—
7	Proto-Celtic	dūnom	stronghold, rampart
8	Proto-Indo-European	dʰewh₂-	smoke; mist, haze

Every word from Proto-Indo-European dʰewh₂- →Every word from Proto-Celtic dūnom →Every word from Proto-Germanic *dūnā →