Where does “Landmarker” come from?

Landmarker (English) comes from English landmark, from Middle English landmark, from Old English landmearc, from Old English land, from Proto-West Germanic land, from Proto-Germanic landą, from Proto-Indo-European lendʰ- — land, heath; loins.

Ancestry of “Landmarker”, step by step

Landmarker traces back through two separate lines of ancestry.

via English landmark

StepLanguageWordMeaning
1EnglishlandmarkAn object that marks the boundary of a piece of...
2Middle Englishlandmark
3Old Englishlandmearcboundary marker to denote the extent of one's...
4Old Englishlandland; a country; region within a country:...
5Proto-West Germaniclandland, area of ground
6Proto-Germaniclandąland, area of ground
7Proto-Indo-Europeanlendʰ-land, heath; loins

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 lendʰ-Every word from Proto-Germanic landąEvery word from Proto-West Germanic land