Where does “sun room” come from?

sun room (English) comes from English Sun, from Middle English sunne, from Old English sunne, from Proto-West Germanic sunnā, from Proto-Germanic sunnǭ, from Proto-Indo-European sh̥₂uén, from Proto-Indo-European sóh₂wl̥ — sun.

Ancestry of “sun room”, step by step

sun room traces back through two separate lines of ancestry.

via English Sun

StepLanguageWordMeaning
1EnglishSunAbbreviation of Sunday
2Middle EnglishsunneAlternative form of sonne; sun
3Old Englishsunnesun
4Proto-West Germanicsunnāsun
5Proto-Germanicsunnǭthe sun
6Proto-Indo-Europeansh̥₂uénsun; the Sun
7Proto-Indo-Europeansóh₂wl̥sun

via English room

StepLanguageWordMeaning
1EnglishroomOpportunity or scope; Space "for" something, or...
2Middle EnglishroumA space or area; A room
3Old Englishrūmroom, space; roomy, spacious, ample, extensive,...
4Proto-West Germanicrūmroomy, spacious; room, open space
5Proto-Germanicrūmazroomy, spacious, open
6Proto-Indo-Europeanrewh₁-free space
Every word from Proto-Indo-European sóh₂wl̥Every word from Proto-Indo-European sh̥₂uénEvery word from Proto-Germanic sunnǭ
sun room — Etymology, Origin & Word History | Etymology Explorer