Where does “weren” come from?

weren (Dutch) comes from Middle Dutch wēren, from Old Dutch werien, from Proto-West Germanic waʀjan, from Proto-Germanic warjaną, from Proto-Indo-European wēr-, from Proto-Indo-European wer- — to burn; to cover, heed, notice; squirrel.

weren (Dutch): to hold back, to keep out; to defend oneself, to...