Where does “doomsdayer” come from?

doomsdayer (English) comes from English doomsday, from Middle English dai, from Old English dæg, from Proto-West Germanic dag, from Proto-Germanic dagaz, from Proto-Indo-European dʰegʷʰ- — to burn; warm, hot.

Ancestry of “doomsdayer”, step by step

doomsdayer traces back through two separate lines of ancestry.

via English doomsday

StepLanguageWordMeaning
1EnglishdoomsdayThe day when God is expected to judge the world;...
2Middle EnglishdaiAlternative form of day
3Old Englishdægday, as a period from sunrise to sunset and as...
4Proto-West Germanicdagday
5Proto-Germanicdagazday; name of the D-rune
6Proto-Indo-Europeandʰegʷʰ-to burn; warm, hot

via English ER

StepLanguageWordMeaning
1EnglishERThe statistic "Earned Run"; Initialism of...
2Turkisherearly; brave; man, male
3Ottoman Turkishایرsaddle, a seat for a rider placed on the back of a horse or other animal
4Old Anatolian Turkishایرearly, at a time in advance of the usual or expected event
5Proto-Turkicēdersaddle
Every word from Proto-Indo-European dʰegʷʰ-Every word from Proto-Germanic dagazEvery word from Proto-West Germanic dag