Where does “latei” come from?

latei (Dutch) comes from French lattis, from Old French lattis, from Old French latte, from Frankish *lattu, from Proto-Germanic laþô, from Proto-Indo-European (s)lat- — beam; log.

latei (Dutch): lintel

Definitions

lintel

Ancestry of “latei”, step by step

Step	Language	Word	Meaning
1	French	lattis	lathwork
2	Old French	lattis	—
3	Old French	latte	a lath
4	Frankish	*lattu	—
5	Proto-Germanic	laþô	board; shelf; bar; shutter
6	Proto-Indo-European	(s)lat-	beam; log

Every word from Proto-Indo-European (s)lat- →Every word from Proto-Germanic laþô →Every word from Frankish *lattu →