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Motto: "Rock Fast"
Arms: Per saltire Or and Azure, a fusil Sable in chief and in base,
and a lymphad, sail furled, oars in action Or, flagged Argent, in each
flank. Crest: On a rock Proper a stag statant at gaze Or, attired,
unguled and langued Azure
Spelling variants: McComas, McHomas, Mctaus, McCoas, McCoase,
McCose, McCoes, McCoss (Mac and Mc are synonymous)
Extant branches of the Clan: clann mhicUilleim McCoss the
Armigerous stem; clann mhicDhaibhéid McCoss; clann mhicIain MacCoss; and
clann mhicSéumas McCoss.
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