Sigurðr — the one true spelling, and the forms that fail it
A letter to a colleague, 31 July 2026 — on the name Sigurðr, and on the forms that keep failing it.
Your note said, roughly: surely the marks are a nicety. Permit me to use Sigurðr to show they are not.
First, the attestation. The tradition's record preserves this name in its romanized scholarly form: Sigurðr — no older script survives to transcribe, so the canonical content is the exactness of the spelling itself.
Say it aloud as the sources heard it: 'SIG-urthr' — stress the first syllable, soften the middle g almost to a glide, sound the ð as the soft 'th' of 'father', and let the final -r hang as a light voiced syllable; it is the Old Norse nominative ending, not a separate vowel. The marks are what carry that sound to a reader who has never heard it spoken.
On the plain form — and I want to be precise, because you pushed on this. The plain form sigurd is not false — it is a fallback, and the register is exact about what that means. In systems that cannot carry diacritics (legacy databases, older tooling, parts of the address-bar pipeline) the flattened form is the accepted vehicle, and the rulebook names it explicitly as the final rung of the fallback hierarchy: full restoration first, circumflex where attested, macron-only by the academic standard, an attested variant, and only then plain ASCII.
What the fallback status forbids is promotion: sigurd may carry the name where marks are impossible, but it may not represent the name where marks are possible. A fallback is a vehicle, never the primary.
Now to the forms that provoked your letter. As for Sigurdr: it comes from the publisher compromise — older books and hurried websites that print the "English equivalent" as if it were the name itself, and it fails because every substitution here (ð→d) is a romanization of convenience, not an attested spelling — it teaches the reader to guess, not to read As for Sigurþr: it comes from the near-miss — a form that looks right at a glance and circulates on wikis and forums, and it fails because eth and thorn are not interchangeable: one is voiced, one is not
One more thing, because it always surprises: the name did not stay home. Sigurðr is the northern twin of a pan-Germanic hero. The continental tradition — preserved in the Middle High German Nibelungenlied (c.
And it never stopped working. No Norse figure has had a longer second life. William Morris retold the cycle in his epic The Story of Sigurd the Volsung and the Fall of the Niblungs (1876), which he called the great story of the North that should be to all his race what the tale of Troy was to the Greeks.
The Convention's Own History
The Poetic Edda survives essentially in one manuscript — the Codex Regius, c. 1270 — and normalized Old Norse spelling descends from what that manuscript and its siblings actually write. Þ and ð are not decorations: they are letters of the alphabet the skalds used (and English later abandoned), and ǫ is a nasal vowel the normalization preserves because the sources carry it. The register's rule is the manuscript's rule: spell the names the way the tradition that sang them wrote them down.
Where Protocol Meets Practice
The technical answer is simple: the canonical marks are legal IDNA 2008 characters, encoded as punycode under `xn--`. The practical answer is messier: legal does not mean stocked (registrar inventory is partial), and stocked does not mean typeable (stacked diacritics defeat mobile keyboards).
So the register's rule is a hierarchy of attested forms — full restoration, circumflex, macron-only, attested variant, and finally plain ASCII for the systems that cannot carry marks. Every rung is defensible because every rung is attested. The forms this register rules against are not rungs; they are errors, and errors do not get rungs.
Write back when you have checked the sources; they are better company than I am.
— The Register
The Verdict
Sigurðr is the canonical form: attested, checkable, and enforced across the temple, the lexicon, the cards, the APIs, and this register. The plain form sigurd is sanctioned as the fallback vehicle and nothing more. The false forms above are documented so that no reader has to take the temple's word on faith — the violations are stated, the sources are named, and the register stands open to challenge on every line.
The temple of Sigurðr stands at /sites/sigurd/.
The docket for this ruling: 2 false forms ruled against, Sigurdr first on the docket; no contested forms attested; the attestation rests on 8 cited sources — Vǫlsunga saga — The Story of the Volsungs, trans. William Morris & Eiríkr Magnússon (Project Gutenberg), The Poetic Edda, trans. Henry Adams Bellows — Reginsmól, Fáfnismól, Sigrdrífumál, Brot af Sigurðarkviðu, Sigurðarkviða en skamma, Guðrúnarkviða (Sacred Texts), The Prose Edda of Snorri Sturluson, trans. Arthur Gilchrist Brodeur — Skáldskaparmál's retelling of the Vǫlsung cycle (Sacred Texts).
The Register Continues
The register holds 293 entries like this one — each temple with its own ruling. Read the temple's founding dispatch for the story, its Restoration File for the philology, its Resonance File for the industries, or the whole archive end to end.
Continue the register — previous entry: sjꜣ (read it) · next entry: Sītā (read it).
The Canonical Register is written from the same canonical record as the lexicon itself. If a false form is missing from this page, it is because the evidence does not support calling it false — or because we have not seen it yet. Show us, with a citation, and the register will answer.