Mispronouncing variables is great fun. We have lots of "txn_XXX" which we pronounce "texan_XXX", and "le_XXX" (short for "leafentry XXX", as in "le_key"), which always make us sound like we're mocking French people.
I've never had a problem with people using different pronunciations. It certainly keeps talking about code fresh.
I recognize pronunciation is more about exceptions than rules, but even so...