Where does “stopfōn” come from?

stopfōn (Frankish) comes from Latin stuppāre, from Latin stuppa, from Ancient Greek στύππη — tow, flax, oakum.

Ancestry of “stopfōn”, step by step

Step	Language	Word	Meaning
1	Latin	stuppāre	to obstruct, block up, plug up, stop, stop up (i.e. with tow/oakum)
2	Latin	stuppa	coarse flax, tow
3	Ancient Greek	στύππη	tow, flax, oakum