There are many many Duncan McColls in the records. You need to join your local Genealogical Society and learn how to research a family tree. Youcannot start from the top down - you must start from the bottom up. You start with yourself and note your parents names, dates of birth etc. Then you advance to your grandparents and keep going up. The first thing agenealogist does is consult the CENSUS ECORDS. tHEY WILL GIVE YOU THE NAME OF THE HEAD OF THEHOUSEHOLD, HIS AGE AND PLACE OF BIRTH. aLSO HIS SPOUSE AND ANY CHILDREN.
In order to find the right Duncan you MUST KNOW the name of his spouse. Marriage records are the most important in genealogical research as they usually indicate the names of the parents. Vital Statistics records are very easy to search in Scotland. Now we don't have to go to the Old Register House as all of the registers havebeen microfilmed and the originals are stored away.You must know the County or Shire . I do not know where you live or were born but that is where you start. Starting from scratch is a long and arduous journey but it is very rewarding to do your own research. All of the Duncans I know of are from Argylshire and I note that your ancestors moved to Perthshire from Argyll If you are near a LDS (Mormon) Library you can read the films there or send for them from Salt Lake City but you MUST READ THEM AT THE LIBRARY. tHE STAFF WILL BE VERY HELPFUL AND HEL YOU FIND THE RIGHT REELS. sORRY i CANNOT PINPOINT YOUR FAMILY AS YOU GAVE SO LITTLE INFORMATION. nEARLY EVERY mCcOLL FAMILY HAS AdUNCAN. good luck