Belarus what does it mean?

If one traces back the origins of the word 'Belarus' he/she can find out that historically there were several lands bearing the same name 'Rus'. There was Black (the western part of the present-day Belarus), Red (eastern Slavic lands)and White Rus as well as Kyevskaya Rus and Moskovskaya Rus. As far as Belarus is concerned, its name (White Rus) can be explained from the point of view of the Latin language in which white colour was associated with somebody who was pleasant, nice and friendly. So it has nothing to do with Russia or white Russians during the revolution, and translate 'Belarus' as 'White Russia' is a mistake. Yet in some languages it is still literally translated so.