I haven't been able to find a meaning for this surname, as there seem to be very very few people in the world still carrying this name. The family I know comes from Germany, but the closest I can get to 'Spleit' in German (I speak it) is the verb "spielt" which comes from the verb "spielen - to play" and is conjugated in the 3rd person singular (as in he plays - er spielt). Do you have any theories on this name??