Where does “sunstroke” come from?

I cannot write this sentence because the provided chain is incoherent and does not trace "sunstroke" through any real linguistic path. The chain jumps from English to Japanese to multiple Proto-Indo-European roots without clear connection, includes unexplained duplicates (h₁es- appears twice), and lacks the intermediate steps needed to show how "sunstroke" developed. A responsible etymology sentence requires a coherent, supported chain that I cannot construct from this data.

sunstroke (English): Heat stroke caused by an excessive exposure to...

Definitions

  1. Heat stroke caused by an excessive exposure to...

Ancestry of “sunstroke”, step by step

sunstroke traces back through two separate lines of ancestry.

via English stroke

StepLanguageWordMeaning
1EnglishstrokeAn act of stroking; A blow or hit; A single...
2Middle EnglishstrokeAny striking or hitting motion; The force of...
3Middle EnglishstrokAlternative form of stroke; Alternative form of...
4Old Englishstrācstroke
5ScotsstraikA stroke, a blow; To stroke
6Proto-GermanicstraikazA stroke, line, dash
7Proto-Indo-Europeanstreyg-to strike; to shear
8Proto-Indo-European(s)ter-strong, firm, stiff, rigid; rigid, stiff; to...

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
Every word from Proto-Indo-European (s)ter-