The family name is actually Mackey (from Bray, Ire.) but has been anglicized to Mackay. I want to know what clan the Mackey's belong to, so I can buy a kilt!

William Mackey and Sarah Redmond both from Bray, Ire. started our American clan in Manhattan, NYC. I'd like to buy something that characterizes the Mackey name. Please help if आप know anything I might use.