I am fortunate in that we were able to trace our family branch of the Mackay Clan back to Alexander Macdonald, Lord of the Isles; via a direct link to Angus Dubh Mackay in the early 1400's. I guess that makes me a Macdonald as much as a Mackay 
Also, if you take a little leap of faith you can then claim that Angus Mackay was a descendant of the original Mackay Chief - One step further and you can apply the most popular and accepted theory as to the origins of the chieftenship of the Clan Mackay, is that the chief was descended from the Pictish Royal House of MacEth.
So - I trump ya all - I am descended from the original Pictish Royal Line as well as the Lord of the Isles 
Brian
Citation for Angus Dubh Mackay's relation to Ian Macdonald, Lord of the Isles:
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Angus 'Dubh' Mackay of Strathnaver1 (M)
#108073 Last Edited 14 May 2005
Angus 'Dubh' Mackay of Strathnaver married Elizabeth MacDonald, daughter of Iain Macdonald, Lord of the Isles and Margaret Stewart, before 8 October 1415.1
Citations
1. [S37] Charles Mosley, editor, Burke's Peerage, Baronetage & Knightage, 107th edition, 3 volumes (Wilmington, Delaware, U.S.A.: Burke's Peerage (Genealogical Books) Ltd, 2003), volume 1, page 449. Hereinafter cited as Burke's Peerage and Baronetage, 107th edition.
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