There were three major migrations of the Coman family from both Scotland and Ireland. The Coman family of today are direct descendants of the once powerful Red & Black Comyn clans of Scotland. ("Red & Black" being derived from the predominant color of each clan's hair.)
In point of fact, when King Balliol of Scotland abdicated his throne there arose 13 legal claimants to that vacancy whose applications were then being adjudicated by the King of England. Robert Bruce and Sir John (The Red) Comyn were two leading contenders.
Thus, in February of 1306, Robert Bruce arranged to meet with Sir John Comyn under a flag of (alleged) unarmed truce in the Abbey at Dumfries Scotland. Bruce engaged the unarmed Comyn in a heated debate, then withdrew a dagger from beneath his cloak and murdered him before the church altar.
Then, in open defiance of the King of England (after Bruce later obtained a Catholic based "absolution" for his crime), he had himself crowned King of Scotland that same year at Scone. Thus began one of the bloodiest periods in all of Scotland's history under Robert Bruce's reign.
The first two migrations of the Coman (variously called Comann & Comyn) clans to America transpired during colonial times, each involving three brothers. One clan settled in and around New York. The other went South to settle in Virginia and the Carolina territories. Yet a third Coman clan (also involving three brothers) came much later and settled on the west coast in Oregon and Washington.
There is also a prophetic legacy that goes with the Coman surname, as clearly indicated in the family history. Perhaps more about this later.
As an added note of interest, the Comyn clans first came to the British Isles with William the Conquerer in 1066.