For champions of the Welsh language, the use of Senedd as the new name for the assembly in Cardiff was a great moment of pride, referring back centuries to a Welsh parliament convened in the early 15th century. It was also recognition that the word had already been adopted by many non-Welsh speakers.

So a move to reject a Welsh-only name in favour of a bilingual moniker has caused disbelief and confusion – and contributed to a growing debate about Welsh identity.

Huw Edwards, the BBC newsreader, is among those baffled. “I’m not in a position to comment on the politics of this, but I can certainly say I’m rather puzzled by the proposal,” he said. “Senedd is now widely established and understood as the name of the democratically elected body in Cardiff Bay. Senedd has strong historical resonance as the word for the representative body assembled in 1404 by Owain Glyndŵrr, the last native prince of Wales.

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“It is not a complex word. There’s none of the usual guff about being ‘difficult to pronounce’, which is always an excuse not to use Welsh in some quarters. It is a Welsh word for the principal democratic body in Wales. What exactly is the problem?”

The Welsh government is understood to be backing the move, tabled by former Welsh first minister Carwyn Jones, to adopt a bilingual name for the national assembly. The proposal would give it the names Senedd Cymru and Welsh parliament. A vote on the idea is due to take place this week.

Jones said that the two names should be adopted because a lot of people would be confused by the Welsh-only name. “There is no doubt that the name Senedd has got more common, but I think if you asked most people, they still wouldn’t really know what it is,” Jones said. “I’ve spent the last 20 years explaining to people what the assembly is. I don’t want to spend the next 20 years explaining what a senedd is. People know what a parliament is. In time they will equate the two. We need an intermediate stage.”

Facebook Twitter Pinterest Huw Edwards: ‘I’m rather puzzled by the proposal.’ Photograph: Jeff Overs/BBC

However, supporters of Welsh independence have pounced on the proposal. “Most people in Wales think sticking to a Welsh name for Wales’s seat of democracy is a no-brainer,” said Adam Price, leader of Plaid Cymru. “Not only would having a single Welsh name be a powerful statement that Welsh belongs to all the people of our country whichever language they speak, having a Welsh name is a symbol of determination to create a new democracy and a new Wales – free from the tired conventions of Westminster. Everyone says Dáil or Bundestag, and understands what it means. Surely we can do the same with Senedd.”

The move against a Welsh-only name has caused concerns in surprising places. Former Tory MP Guto Bebb, among those to have the whip withdrawn for voting against a no-deal Brexit, said: “What problem are we trying to solve here? The answer is, there isn’t one. I’m supportive of bilingualism and treating both languages equally, but in this context the Welsh name makes sense. It works.”

The debate comes amid indications that the tumult engulfing British politics is beginning to affect Welsh identity, with the idea of Welsh independence not as far-fetched as it was just a few years ago. While a recent poll suggested that only 24% supported independence with 48% against, the notion of being “indy-curious” in Wales appears to be on the rise – and the whole issue is now a more mainstream debate.

Pro-independence rallies have attracted crowds of thousands. A march in Merthyr Tydfil included former Wales rugby captain and commentator Eddie Butler, as well as former Everton and Wales goalkeeper Neville Southall. Last week Aberystwyth became the latest town council to back Welsh independence. It follows Caernarfon, Caerphilly and Blaenavon, in Gwent, whose Labour-run council backed independence.

“The debate around the bilingual name for the assembly is a little micro-example of much bigger issues going on about our national status within Wales and what it means to be a nation within a larger nation state,” said Roger Awan-Scully, head of politics and international relations at Cardiff University. “The one thing that has changed [in the Welsh independence debate] is that it has moved from an issue discussed almost exclusively within Plaid Cymru and a tiny group of other people to something that is more a part of the mainstream debate.”

Carwyn Jones, himself a Welsh speaker, said: “I always said that a bad Brexit carries with it the seeds of the UK’s own disintegration. It has happened very quickly. As somebody not in favour of independence but who wants to see change, that troubles me.”