The surname Leathead was first found in the county of Edinburgh at Leith, a burgh and sea-port town. "This place, which is of considerable antiquity, formerly belonged to the abbey of Holyrood, and, in a charter of David I. to the monks of that establishment, is noticed under the designation of Inverleith, from its position near the influx of the river or Water of Leith into the Frith of Forth." 
Early History of the Leathead family
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The motto was originally a war cry or slogan. Mottoes first began to be shown with arms in the 14th and 15th centuries, but were not in general use until the 17th century. Thus the oldest coats of arms generally do not include a motto. Mottoes seldom form part of the grant of arms: Under most heraldic authorities, a motto is an optional component of the coat of arms, and can be added to or changed at will; many families have chosen not to display a motto.
Motto: Trustie to the end Motto Translation: Trustworthy to the end