Where does “seinien” come from?

seinien (Middle English) comes from Old English seġnian, from Proto-Germanic segnōną, from Latin signō, from Latin signum, from Proto-Italic seknom, from Proto-Indo-European sek- — to cut, cut off, sever.

Ancestry of “seinien”, step by step

Step	Language	Word	Meaning
1	Old English	seġnian	to mark; sign
2	Proto-Germanic	segnōną	to mark with a cross, bless
3	Latin	signō	to mark, sign
4	Latin	signum	visible indication: sign, mark, signal; seal,...
5	Proto-Italic	seknom	sign
6	Proto-Indo-European	sek-	to cut, cut off, sever

Every word from Proto-Indo-European sek- →Every word from Proto-Italic seknom →Every word from Latin signum →