Quick facts
Last updated August 2026
What it means
“Seiriol Dafydd is a Welsh boys' name combining Seiriol, the name of an early Welsh saint, with Dafydd, the Welsh form of David. The full name feels deeply Welsh, saintly, literary, and historic.”
Seiriol Dafydd is the kind of name that sounds as if it belongs beside stone churches, sea air, and old Welsh stories. The first name, Seiriol, is best known through Saint Seiriol, an early 6th-century saint connected with Penmon on Anglesey, off the coast of north Wales. The source material does not give a secure literal meaning for Seiriol, so the most honest way to explain it is by its history: it is a Welsh saint's name with strong ties to Anglesey, Penmon Priory, and Ynys Seiriol, also known in English as Puffin Island. Dafydd gives the name a clearer etymological anchor. It is the Welsh form of David, pronounced with the Welsh double d sound, like the voiced th in this. David is one of the best-known biblical names across many languages, and Dafydd is its unmistakably Welsh form. Behind the Name lists Dafydd as masculine and Welsh, with related forms and variants including David, Dewi, Taffy, and the diminutive Dai. That makes Dafydd familiar in meaning and heritage, while still feeling rooted in Welsh speech and tradition. Together, Seiriol Dafydd has a layered quality. Seiriol brings the feel of an early Celtic Christian saint, a quiet place by the water, and an old local story preserved through place names. Dafydd brings centuries of Welsh use, from rulers to poets. Dafydd ap Gruffydd was a 13th-century Welsh ruler, and Dafydd ap Gwilym was a 14th-century poet, so the middle name carries both leadership and literary weight. For parents, the beauty of Seiriol Dafydd is that it doesn't need to shout. It has substance. It is rare, strongly Welsh, and meaningful through the people and places attached to it. If you want a name that feels gentle but not flimsy, old but not dusty, and clearly tied to Welsh culture, this pairing has a lovely steadiness.
Why parents love it
Parents who love Seiriol Dafydd are usually looking for something with real roots. This isn't a name that feels copied from a chart. It feels chosen with care. Seiriol brings a quiet saintly beauty. You can picture Penmon on Anglesey, the old well, the cell, and the island that still carries his name. It's rare, but it isn't made up. That matters if you want something distinctive with history behind it. Dafydd makes the name easier to place. Many people recognize David, and Dafydd is its Welsh form, so the middle name gives family and friends a bridge. It also brings strong Welsh associations through Dafydd ap Gruffydd and Dafydd ap Gwilym, linking the name to leadership and poetry. The full pairing has a lovely shape: Seiriol is airy and unusual, Dafydd is firmer and familiar within Welsh tradition. Together, they sound thoughtful, brave, and unmistakably Welsh. For a family with Welsh heritage, a love of Welsh names, or a pull toward names with religious and literary history, Seiriol Dafydd is a meaningful choice that still leaves a child space to make it his own.
Heritage
Seiriol Dafydd sits firmly within Welsh cultural and religious history. Seiriol is remembered as an early 6th-century saint from north Wales. According to the source material, he created a cell at Penmon Priory on Anglesey and later moved to Ynys Seiriol, now also known as Puffin Island. His feast day is listed as 1 February, and he is venerated in the Eastern Orthodox Church, the Anglican Communion, and the Roman Catholic Church. That gives the name a gentle religious presence without making it feel overly formal. The stories around Saint Seiriol are local and vivid. His cell at Penmon is associated with St Seiriol's Well, Ffynnon Seiriol, and the remains are protected by Cadw, the public body responsible for historic monuments in Wales. The source also mentions the legend of Seiriol and Saint Cybi meeting weekly near Llanerchymedd, which gives the name a very human warmth: friendship, habit, landscape, and faith all in one small story. Dafydd adds another major Welsh thread. As the Welsh form of David, it connects this name to a biblical classic while keeping the sound and spelling Welsh. It also appears in Welsh history and literature through Dafydd ap Gruffydd, a 13th-century Welsh ruler, and Dafydd ap Gwilym, a 14th-century poet. Parents choosing Seiriol Dafydd are choosing a name with religious memory, Welsh language identity, and a strong sense of place.
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Seiriol's link with a saintly hermitage at Penmon gives the name a calm, thoughtful feeling.
The name is tied to Welsh places, Welsh pronunciation, and figures from Welsh religious and literary history.
Dafydd carries a literary association through Dafydd ap Gwilym, a 14th-century poet.
The full name has an old, grounded sound that feels more enduring than trendy.
Original
Seiriol Dafydd
Rhys keeps the Welsh sound strong while adding a short, crisp finish.
Owen is familiar outside Wales, so it softens the rarer first name without losing the heritage feel.
Iwan gives the full name another Welsh form of a classic biblical name.
Ellis has a gentle rhythm that balances the weight of the two Welsh names.
Morgan adds a friendly, widely recognized Welsh surname-name sound.
Pair two names and see how they sound, flow, and feel together.
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