Numbers is Septuagint Version

The Septuagint ( or"LXX") is the Greek version of the Old Testament translated in between 3rd to 1st century BC in Alexandria. It is the oldest of several ancient translations of the Hebrew Bible into Greek.
In Hebrew Bible the book of Numbers is called as "Bemidbar i.e., "in the wilderness." ". In Sptuagint version the book is called 'Arithmoi' i.e 'Numbers'