Caswallon as a Baby Name. Meaning and Origin of Caswallon

What is the meaning of the name Caswallon ?

The baby name Caswallon is a Male name , 3 syllables long and is pronounced kas-WAL-on (approx. /kæsˈwælən/ in English; Welsh approx. /kasˈwaɬɔn/).

Caswallon is Welsh in Origin.

Caswallon is the Welsh form of a Brittonic royal name borne by the 1st‑century BCE war leader whom the Romans recorded as Cassivellaunus. Etymology points to Proto‑Celtic elements kassi + uellaunos: the second means “chief, prince,” while the first is debated - perhaps “ardent/valiant,” “curly,” or the ethnonym Cassi. The whole may be interpreted as “valiant chief” or “leader of the Cassi.” In medieval Welsh, the name appears as Caswallawn, preserving the older Brittonic sound pattern.

The figure endures in Welsh legend as Caswallawn fab Beli Mawr and in Geoffrey of Monmouth’s Latinized chronicle as Cassibel(l)anus, cementing the name in British historical lore. Modern variants include Caswallawn (Welsh), Caswallon (Welsh/anglicized), Cassivellaunus (classical), and Cassibel(l)anus/Cassibelan (medieval English). Usage today is rare but occasionally revived in Wales and among Celtic‑revival namers; informal diminutives may include Cas or Wall.

⚙ Caswallon is absent from every birth registry and name dataset we follow. Names like this are usually very rare, tied to a particular region or tradition, or freshly invented. However you look at it, very few people share it.