I do prefer Coach Lavin, to show that I have respect for him. I would never call Coach Carnesecca, "Little Louie", but I have always fondly thought of him as Louie. I would never call Coach Lavin, Lav or Lavs, simply because I think they are dumb nicknames. But if others call him that, with no harm intended, it doesn't really bother me. I just personally think one should address him with respect.
Speaking of respect, why does the spell checker on this sight, question the name Carnesecca, and not Lavin?