We came across this definition of atlatl in an online dictionary the other day.
The dictionary lists the origin of the word atlatl from the Nahuatl language but then says its first know use was 1871. We’re not quite sure where the 1871 date comes from.
However one neat thing is that the dictionary does offer an audio pronunciation.
First known use in English, as it’s an English dictionary. Implying atlatl entered English usage in 1871.