Mackay Mountains is a prominent group of peaks 10 miles south of the Allegheny Mountains

Allegheny Mountains

The Allegheny Mountain Range , also spelled Alleghany, Allegany and, informally, the Alleghenies, is part of the vast Appalachian Mountain Range of the eastern United States and Canada...

 in the Ford Ranges

Ford Ranges

The Ford Ranges is a grouping of mountain ranges standing east of Sulzberger Ice Shelf and Block Bay in the northwest part of Marie Byrd Land, Antarctica...

, Marie Byrd Land

Marie Byrd Land

Marie Byrd Land is the portion of West Antarctica lying east of the Ross Ice Shelf and the Ross Sea and south of the Pacific Ocean, extending eastward approximately to a line between the head of the Ross Ice Shelf and Eights Coast. It stretches between 158°W and 103°24'W...

. They were discovered by the Byrd Antarctic Expedition in 1934, and named for Clarence Mackay

Clarence Mackay

Clarence Hungerford Mackay was an American financier, believed to inherit most of a $500 million estate in 1902. In 1926, his daughter Ellin married Irving Berlin against her father's wishes and he disinherited her....

 of the Postal Telegraph and Mackay Radio Companies, who was a benefactor of the expedition. (Note - The Wikipedia article about Clarence Mackay's long dead father, John William Mackay

John William Mackay

John William Mackay was an American capitalist, born in Dublin, Ireland.-Early years:His parents brought him in 1840 to New York City, where he worked in a shipyard.-Gold and silver mining:...

, attributes the name to him.)