French word suicide comes from French même, French soi ((dated) himself, herself, itself. One. Oneself.), Middle French soy-mesmes ((emphatic) oneself.)

Detailed word origin of suicide

Dictionary entry	Language	Definition
même	French (fra)	(used before the article) even (used after the noun) very. (used before the noun) same.
soi	French (fra)	(dated) himself, herself, itself. One. Oneself.
soy-mesmes	Middle French (frm)	(emphatic) oneself.
soi-même	French (fra)	(emphatic) oneself.
suicide	French (fra)	Suicide.

Words with the same origin as suicide