Clan Donnachaidh (Duncan) Center: Official site for the clan, including the surnames Duncan, Robertson and Reid. History, chiefs, lands, crest, arms, tartans and information on the Donnachaidh clan centre.
Clan Donnachaidh Society: History, crest, music, name variants and international branches.
Clan Duncan Society: Based in the Scottish Highlands, the society aims to bring together those with the name Duncan and it´s alternative spellings.