Where does “swār” come from?

swār (Old Dutch) comes from Proto-West Germanic swār, from Proto-Germanic swēraz, from Proto-Indo-European swēr- — heavy.

Ancestry of “swār”, step by step

Step	Language	Word	Meaning
1	Proto-West Germanic	swār	heavy
2	Proto-Germanic	swēraz	heavy; grave, grievous, serious, important
3	Proto-Indo-European	swēr-	heavy

swār — Etymology, Origin & Word History | Etymology Explorer