I like the pun with thoroughbrew, but I'm always a bit hesitant to have somepony be named something that is an adult activity. Brewing in this case.
How about:
Venerable Spirit
Venerable accounting for "accorded a great deal of respect, especially because of age, wisdom, or character." Could mean of good character or old as aged whiskey when combined with spirit
Spirit having the obvious double meaning of both soul and alcoholic beverage
So either Respected Soul or Good Old Whiskey
His nickname could be Vinny