A-ca-oo-mah-ca-ye

Aka-Omahkayii (also Ackomokki or A-ca-oo-mah-ca-ye (Blackfoot syllabics: , meaning Old Swan), was the name of three Siksiká chiefs between the late 1700s and 1860.

==Aka-Omahkayii/Old Swan (I)== The first Aka-Omahkayii () was described by Duncan M'Gillivray, the North West Company clerk at Fort George, as "once the greatest of this Nation and was respected and esteemed by all neighboring tribes." By the time Aka-Omahkayii was chief, the Blackfoot/Plains Confederacy had consolidated power throughout he plains of what is modern-day Montana, Alberta, and western Saskatchewan. He was known as a peacemaker who was open to trade with Europeans. Aka-Omahkayii realized that establishing a direct relationship with Euro-Canadian traders would benefit the Siksiká by bypassing Cree and Assiniboine middlemen. As he grew older, Aka-Omahkayii was forced to step aside as chief, but he remained a respected elder of the tribe until his death following a fall in 1795.