Online Etymology Dictionary puts the origin as such:
"deliberate killing of oneself," 1650s, from Modern Latin suicidium
Wiktiobary here puts:
Suicide, 1651, New Latin coinage (probably originating in English) suīcīdium, from Latin suī (from suus (“one’s own”)) + -cīdium (“killing”). Compare self-slaughter, self-blood. Equivalent to -cide.
It quite stupified me to realize that from all the -cide words, quite a few originating from the later 16th century or early 17th century, the most famous of them all, at least in our collective modern vocabulary, "suicide", did not exist until the 1650s, and I cannot seem to find an older word which would have been used prior to "suicide's" coinage.
I am currently writing a period-piece set in the 1620s, and am looking for a word that existed during this period or prior, that would have been used in the self-same meaning as "suicide".
Shakespeare does use "self-kill" in Sonnet 71, which if all goes to the dogs, might be adequate, and I did find "felo-de-se", which is old enough, but I would rather not use Latin.
Edit: I found this on here
Evidence recounted here suggests that suicide was devised by Sir Thomas Browne and first published in his book Religio Medici in 1643.
Any suggestions would be appreciated.