I can't understand the discussion in Welsh, but I can see this change has been discussed with no obvious dissent, and all three recently-active users have commented there, so let's do this.

Change 84221 had a related patch set uploaded by TTO:
Change name of cywikisource to "Wikidestun"

https://gerrit.wikimedia.org/r/84221

eleriygarregwen wrote:

Oh dear. Comment 2 says that name is to be changed to Wikidestun. But it should be Wicidestun.

eleriygarregwen wrote:

There is a comment at cy.wikipedia.org about the recent request for localisation of the wikisource logo, with a picture of the new logo. The text is "Wicidestun" - see https://cy.wikipedia.org/wiki/Wicipedia:Y_Caffi#Wicidestun.

So perhaps there has been a typo in raising change 84221?

Sorry about that! The typo was only in the description not the actual code change.

Change 84221 merged by jenkins-bot:
Change name of cywikisource to "Wicidestun"

https://gerrit.wikimedia.org/r/84221

It works!