hreflang="cy"

cy is a valid hreflang value for Welsh.

Language: Welsh (cy, ISO 639-1)

Example

<link rel="alternate" hreflang="cy" href="https://example.com/cy/" />

The code is case-insensitive for Google. The conventional spelling is a lowercase language, a title-case script and an uppercase region: cy.

Without a region, the annotation targets every Welsh speaker regardless of country. Regional versions sit next to the language-only version in one cluster.