So who are these Mlēcchas?
These people were pastoral migrants out of the cultivated river plains.
The main source of this sustenance is milk. Indeed, my theory is that the word “Mlēccha” comes from the same root as “Milch/Milk”.
paleoglot.blogspot.com/2010/03/indo-e…!
My theory is that “Mleko”, “Milch” etc. come from a very old word for “licking”.
My opinion is that both the north European and the south European root words come from this. The prefix “me” denotes the mother who provides the milk for the baby to lick. The prefix “go” refers to the cow.