The possessive form for the proper noun MacKaye is MacKaye's.
Example: Ms. Mackaye's office is on the second floor.
Benton MacKaye was born in 1879.
Benton MacKaye died in 1975.
James MacKaye was born in 1872.
James MacKaye died in 1935.
Ian MacKaye is 5' 9".
Ian MacKaye was born on April 16, 1962.
Ian MacKaye was born on April 16, 1962.
Abdelwahid Aboud Mackaye was born in 1953.
Dorothy Mackaye's birth name is Dorothy A. McKay.
Dorothy Mackaye was born on May 8, 1899, in Colorado, USA.
Benton MacKaye Trail Association was created in 1979.
The singular possessive form is heart's; the plural possessive form is hearts'.