My surname is Moore but if you go back in time when people couldn't read or write it was spelt Moor without the e as that was phonetic way. Brian is quite right no truth in it!
Best wishes, John
Whilst researching my tree I have found that the Moore side of my family seems to have come over from America around 1790 from North Carolina and settled in a place called Edingale Staffordshire as an Innkeeper of an alehouse called The Holly Bush.