Plans to create new 'super constituencies' at the next Senedd elections have been altered for the Cardiff and Penarth areas.
The Cardiff South and Penarth seat was initially due to merge with Cardiff West as part of wider reforms set to be introduced in 2026.
But Democracy and Boundary Commission Cymru (DBCC) says it is now considering an alternative pairing with the Cardiff East constituency.
Plans to merge the Vale of Glamorgan constituency with that of Bridgend remain unaffected following a public consultation.
The Senedd will expand from 60 to 96 members and adopt a new electoral system, with the 32 constituencies used in July's Westminster general election paired to create 16.
Under its revised propsoals published on Tuesday, most of the new 'super constituencies' - which will elect six members - will be referred to by a Welsh-language only name.
The merged constituency for Bridgend and the Vale of Glamorgan would be known solely as 'Pen-y-bont Bro Morgannwg'.
The public consultation found reaction to the new super constituency was only narrowly in favour (16 in support and 14 against) - with opponents suggesting alternative proposals such as pairing the Vale with Cardiff South and Penarth.
Only one out of eleven responses favoured the name 'Vale of Glamorgan and Bridgend' - with alternative names proposed including South Glamorgan, Pen-y-bont Barry and Ogwr Morgannwg.
The DBCC argues that pairing the two areas is appropriate "due to the good transport and communication links" within the proposed area.
The new alternative proposal to merge Cardiff South and Penarth with Cardiff East would be referred to only as 'De-Ddwyrain Caerdydd Penarth'.
Initial proposals to pair Cardiff South and Penarth with Cardiff West were supported by 59 respondents and opposed by 28 - with further suggestions made about pairing both Vale constituencies.
A DBCC spokesperson said it acknowledged the representations made to pair the two Vale areas - but insisted "this would have a disruptive impact on well-supported pairings across the surrounding area, therefore creating a less desirable set of constituencies overall."
On the new proposals for the Welsh capital, they added: "This pairing responds to arguments made in representations that there are strong linguistic and historic ties, as well as stronger transport links, between Cardiff West and Cardiff North."
" It would also reunite the electoral ward of Cathays with other areas that formed the former Cardiff Central UK Parliamentary constituency."
"The Commission considers that pairing the areas as proposed is appropriate due to the good transport and communication links within the proposed constituency."
A final 4-week public consultation is now being held on the revised proposals - with the Commission set to announce its final decisions at the end of March.
Shereen Williams, the DBCC's chief executive, said: "These revised proposals represent a significant step on the journey to creating Wales’s new constituencies."
She added: “The rules in place for this review mean that certain proposals can’t be changed, but following the feedback we received from the public, we have made significant adjustments to the proposed names, as well as changing the configuration of constituencies in the Cardiff area."
"The Commission remains open to making further changes, depending on the representations we receive during this consultation, so we urge everyone to share their views before 13 January 2025."
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