Where does “spioon” come from?

spioon (Estonian) comes from German Spion, from French espion, from Middle French espion, from Old French espion, from Frankish *spehō, from Frankish spehōn, from Proto-Germanic spehōną, from Proto-Indo-European speḱ- — to see, to look, to observe.

spioon (Estonian): spy

Definitions

Ancestry of “spioon”, step by step

Step	Language	Word	Meaning
1	German	Spion	spy; peephole
2	French	espion	spy
3	Middle French	espion	—
4	Old French	espion	spy
5	Frankish	*spehō	—
6	Frankish	spehōn	to spy, watch; to peer, to look, to spy
7	Proto-Germanic	spehōną	to peer, look, spy
8	Proto-Indo-European	speḱ-	to see, to look, to observe

Every word from Proto-Indo-European speḱ- →