Common
With all due respect, this is possibly the silliest poll I've seen so far. There is nothing remotely close to "Common" in real life. The idea of a Common language in D&D is an artificial (and not a very realistic) game convention meant to get around the in-play difficulties that would result from characters of different nationalities/races speaking different, mutually unintelligible tongues. Sure, Greek and Latin were fairly widely spoken in the Roman Empire, and Aramaic in the biblical Middle East, French and Spanish at were pretty widespread in colonial times, etc., but never to the extent that Common is spoken in any of the major campaign settings.
With all due respect, this is possibly the silliest poll I've seen so far. There is nothing remotely close to "Common" in real life. The idea of a Common language in D&D is an artificial (and not a very realistic) game convention meant to get around the in-play difficulties that would result from characters of different nationalities/races speaking different, mutually unintelligible tongues. Sure, Greek and Latin were fairly widely spoken in the Roman Empire, and Aramaic in the biblical Middle East, French and Spanish at were pretty widespread in colonial times, etc., but never to the extent that Common is spoken in any of the major campaign settings.