The name Kenneth has its origins in the Gaelic language, which was spoken by the Celts in regions of Scotland, Ireland, and the Isle of Man. It is derived from the Gaelic words "ced" meaning "born of fire" and "nath" meaning "something burnt". Together, the name Kenneth is believed to have originally meant "born of fire" or "fire-born".

The earliest recorded use of the name Kenneth dates back to the 6th century, where it was found in ancient Scottish and Irish texts. It is thought that the name was initially associated with royalty or nobility in these regions, as several early Scottish kings bore the name.

One of the most notable historical figures named Kenneth was Kenneth I, who ruled as the King of Scots from 844 to 858 AD. He is credited with bringing together the Picts and Scots, laying the foundation for the Kingdom of Scotland.

Another famous bearer of the name was Kenneth III, who reigned as the King of Scots from 997 to 1005 AD. He was known for his efforts to promote Christianity and establish the Church's influence in Scotland.

In the 12th century, Kenneth Baliol, a Scottish nobleman, played a significant role in the Scottish Wars of Independence against England. He was a prominent supporter of King William the Lion.

In the 16th century, Kenneth Mackenzie, a Scottish nobleman and chief of the Clan Mackenzie, was known for his involvement in the Highland clan wars and his efforts to expand the Mackenzie clan's territory.

Saint Kenneth, also known as Kenneth of Aghaboe, was an Irish monk and abbot who lived in the 6th century. He is revered as the patron saint of the Leinster region in Ireland and is associated with several monasteries and churches.

Throughout history, the name Kenneth has been popular across various cultures and societies, particularly in Scotland, Ireland, England, and parts of North America. Its association with nobility and historical figures has contributed to its enduring popularity over the centuries.