Anyone could always write the Lyon Court to verify the existance of any Scottish Clan and if one has been named as chief and granted the Arms of the Name.
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Their address is ;
H M New Register House
Tele.0131 556 7255
Lord Lyon King of Arms: Sir Malcolm Innes of Edingight KCVO, WS
Lyon Clerk and Keeper of the Records: Mrs. C. G. W. Roads, MVO
I'm certian anyone on the staff of the Lord Lyon would be able to put this issue to rest once and for all.