Warren, there are several different crests and coats of arms for the name of Aiken. The one which you saw on the Clan Akins web-site is in fact the arms and crest of Akins of that Ilk and the crest may (in the form of a clan-badge) be worn by anyone who is a member of the Clan Akins (which includes the spellings of Ackin, Aicken, Aiken, Aikin, Eakin, etc.). As for other Aiken crests and coats of arms, there is that of the Aiken of Dalmoak granted to James Aiken of Dunbartonshire, Scotland in 1892 whose crest is a dexter (right) hand couped (cut off) at the wrist, holding a garland of oak-leaves proper (natural colors)with the motto "In robore decus". Another crest for Aicken or Aiken is a fountain throwing up water proper. The crest for Aikin of Liverpool is an oak tree vert (green), with the motto "Sub robore virtus". Crests and the coats of arms to which they belong were issued to individual armigers and are their personal property. The concept of a "family coat of arms" is based upon the fact that individuals who are descended from a person who has been granted arms, may themselves apply for grants of arms in the form of a differenced version of the original arms, but only the senior direct heir of and armiger may inherit the undifferenced version of the original arms. For more information, you might find a copy of Burke's Directory of Gentlemen of Coat Armour, or his Armigerous Families to be useful.