Thank you all for your help so far!
1) Are any of you familiar with any of the following variations of the name Dolagh/Dolla(o)ugh either as a place name or surname: Dalac, Dolack, Dolhough, Dolhaugh, Dolhoff? 
2) And how would you say ough or 'augh' when there is an 'h' in the front as in 'hough' and 'haugh'? 
3) Has any one ever heard of the name CHRISTIAN (LOGARDIN) DOLHOOFE/Dolloff, or with any of the above surnames?