Seisyll as a Baby Name. Meaning and Origin of Seisyll

What is the meaning of the name Seisyll ?

The baby name Seisyll is a Male name , 2 syllables long and is pronounced /ˈseɪ.sɪɬ/ (approx. "SAY-sihl" with Welsh ll [ɬ] at the end).

Seisyll is Welsh in Origin.

Seisyll is a Welsh masculine name (approx. SAY-sill; final ll is the voiceless Welsh sound) whose etymology is generally traced to Latin Sextilius, from sextus “sixth.” Medieval spellings include Seisyllt, Sisyllt, and Sitsyllt. Because of parallel Latinization, it has long been associated with the English surname and given name Cecil, though Seisyll is not derived from Caecilius (“blind”) and the linkage is historical rather than semantic.

Attested across early medieval Wales, the name appears in royal and noble lineages: Seisyll ap Clydog, king of Ceredigion, gave his name to the kingdom of Seisyllwg in the 8th–9th century; later, Seisyll ap Dyfnwal was a notable lord involved in the events at Abergavenny (1175). Use waned after the Middle Ages but survives in Welsh-language circles; modern variants include Seisyll and Seisyllt, with Cecil as a long-established Anglicized counterpart.

⚙ Seisyll is absent from every birth registry and name dataset we follow. That usually points to a very rare, regional, or newly coined name. However you look at it, very few people share it.