The baby name Seisyllt is a Male name , 2 syllables long and is pronounced SAY-silt (approx. /ˈseɪsɪlt/).
Seisyllt is Welsh in Origin.
The baby name Seisyllt is a Male name , 2 syllables long and is pronounced SAY-silt (approx. /ˈseɪsɪlt/).
Seisyllt is Welsh in Origin.
A Welsh masculine name of early medieval vintage, Seisyllt is the Old/Middle Welsh form of Seisyll, ultimately traced to the Roman family name Sextilius (from Latin sextus “sixth”). The element likely entered Brittonic during the Roman period and was adapted to Welsh phonology; the terminal -t reflects older orthography, with the modern form dropping it to yield Seisyll.
Borne by princes and magnates - most notably Seisyll ap Clydog, whose name gave the kingdom of Seisyllwg - it appears as Sisillius in Latin chronicles including Geoffrey of Monmouth. Medieval genealogies of Welsh Marcher families preserve the name; its legacy is sometimes linked with the surname/given name Cecil in Welsh contexts. Variants and related forms: Seisyll (modern Welsh), Seisyllt (archaic/poetic), Latinized Sisillius. Meaning: “of the Sextilius clan,” or by extension “the sixth(-born).” The name remains rare today but recognized in Welsh revival naming as a culturally resonant choice.
Seisyllt is absent from every birth registry and name dataset we follow. That's typically a sign of a rare name, a regional or traditional one, or a modern coinage. By any reading, it's an exceptionally uncommon choice.
Did we miss something about this name? Let us know!