The world calls it battle of Poitiers, because it was (slightly) closer. The English (and all of those who've been taught history by them) call it battle of Tours.

That's because there's another battle of Poitiers in the 100-years war, which the English won, so it's a sort of disambiguation.

You're right, but also wrong: non-Anglosaxon Europeans call it battle of Poitiers, but the British had their own battle of Poitiers, so they call this one battle of Tours. Since this site follows mostly US naming - which is in turn derived by the British one, then "Tours" makes sense.

Also, the Franks were actually blocking the way to Tours, not to Poitiers.

As the original tradition is in Latin, it's slightly disputed whether the meaning is "little Mars" (as in "good at war") or actually "the hammer", as in "the hammer of God" (see Judah Maccabee from the Bible).