Alexander's mother, Sehoy Marchand, was the daughter of Sehoy, a mixed-race Creek woman of the prestigious Wind Clan ("Hutalgalgi"), and of Jean Baptiste Louis DeCourtel Marchand, a French officer at Fort Toulouse.
According to tradition, the French commander Captain Jean Baptiste Louis DeCourtel Marchand married the high-status Creek woman Sehoy in about 1720.
Lachlan married Sehoy Marchand, member of the Wind Clan of the Creek, a daughter of Jean Marchand and Sehoy
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Sehoy III married a man named Weatherford, and one of their sons was William Weatherford, better known to history by his Creek name, translated as Red Eagle.
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Early biographers claimed Sehoy Marchand was the daughter of a French officer at Fort Toulouse named Jean-Baptiste Marchand.
The most prominent was Alexander McGillivray, the son of Sehoy, a Wind Clan mother, and Lachlan McGillivray; and William Weatherford (better known in history as Red Eagle or Lamochatta), also born to the Wind Clan.