Where does “sæktæ” come from?

sæktæ (Old Danish) comes from Old Norse sekt, from Old Norse sekr, from Proto-Germanic sakjaz.

Ancestry of “sæktæ”, step by step

Step	Language	Word	Meaning
1	Old Norse	sekt	penalty
2	Old Norse	sekr	guilty; convicted, outlawed, condemned to...
3	Proto-Germanic	sakjaz	—