The name Kennith is an English given name derived from the Celtic roots "cen" meaning "chief" or "leader" and "nath" meaning "born" or "fire." Its origins can be traced back to the early medieval period in Britain.

In its earliest forms, the name was spelled as "Cenath" or "Cennath" in ancient Celtic languages. As the Anglo-Saxon influence grew in Britain, the name evolved into "Cynneth" and eventually "Kennith" by the 8th or 9th century.

One of the earliest documented references to the name Kennith can be found in the Anglo-Saxon Chronicle, a collection of annals documenting the history of the Anglo-Saxons. The name is mentioned in entries from the late 9th century, referring to a nobleman or chieftain.

The name Kennith gained popularity among the nobility and ruling classes in medieval England. One notable figure was Kennith of Wessex, a Saxon thegn (nobleman) who served under King Alfred the Great in the 9th century. He played a crucial role in the defense against Viking invasions.

Another prominent bearer of the name was Kennith the Red, a Scottish nobleman and warrior who lived in the 11th century. He was known for his military exploits and his loyalty to King Malcolm III of Scotland.

In the 12th century, a Benedictine monk named Kennith of Durham wrote a chronicle documenting the history of the Durham Cathedral and the surrounding region. His work, known as the "Historia Regum," is an important source for understanding the Anglo-Norman period in northern England.

During the 13th century, a Welsh nobleman named Kennith ap Gruffydd led a rebellion against the English rule in Wales. Although ultimately unsuccessful, his resistance efforts became a symbol of Welsh nationalism.

Fast-forwarding to the 16th century, Sir Kennith Digby was an English courtier, diplomat, and scholar who served under King James I. He was known for his interest in alchemy, philosophy, and his literary works.

These are just a few examples of notable figures throughout history who bore the name Kennith. While its popularity has ebbed and flowed over the centuries, the name has maintained a strong connection to its Celtic roots and associations with leadership, nobility, and valor.