Hi! I reverted the anon's edit because muil is already properly at *mūlą. I updated the etymology at muil to match.
The gender doesn't match that though. The modern Dutch word is masculine.
I know. When we first created the PGmc entry, we ended up placing it there as best/closest fit I believe we determined the Middle Dutch forms in -e (mule, muyle) were in dative case, so fem was ruled out