lol. I missed that reference in Elgood, Ariel. Are you running out of reading material yet? How's the foot?
I think the similarity in names is coincidental. I agree with PUFF that some forms of dha/daab descend from Chinese dao, and will add that a compelling argument can be made that some are closely related to Naga and Kachin weapons (sword dao) of far northeast India, Assam and Burma.