Dubh Mhor

[fifer1947]

Could that be taken to infer tall/swarthy or dark? 

Reason for asking is my Stewarts, mostly male line, from my brother (+ my mother 5'10") going back at least 4/5 generations were all over 6 foot and of a dark complexion. 

Hoping some of our Gaelic speakers can advise.

Brick wall hence severe case of straw clutching      

NOTE:  at 5'4" I am a relative pygmy by comparison 

[KGarrad]

Dubh = black
Mhor = Large or great

[Forfarian]

Could that be taken to infer tall/swarthy or dark?

Yes.

'Dubh' means black or dark.
'Mòr' means big. (ignore the 'h': there are reasons for it sometimes being there but it would be complicated to try to explain them)

[fifer1947]

My thanks to you both  maybe, just maybe, my straw clutching has a little merit. 

[eilthireach]

It does not necessarily imply that the person is tall. In a family where, for instance, there are two children with the same name (yes, it happens), the elder will be mòr and the younger will be beag ("small"). And in a situation such as mine, I was [name] Mòr (I'm not!) and my much younger brother-in-law was [name] Beag or when people are talking about a family where the father is Donald and the son is Donald and they wish to specify which Donald they are talking about, they might say Dòmhnall Mòr if they mean the father (though in actuality the two are more likely to have their own nicknames which would distinguish them). Dubh does not imply swarthy. It will in most cases simply mean dark-haired.