Obscure Welsh name

[mezentia]

I have been researching a family with the surname Ninnis who lived in Glamorgan - an unusal enough surname as it is. However, I have found a marriage entry for a Cadnass Ann Ninnis, a Welsh name I've not come across before. She was baptised simply as Ann Ninnis, and appeared so on the 1901 and 1911 censuses. The marriage entry can be found here:

https://www.ancestry.co.uk/discoveryui-content/view/375706:62105?tid=50949494&pid=282514020754&hid=1047919635421

Is Cadnass a traditional Welsh name? Is it a misspelt version of another name? If it's not traditional, where does it come from?

[CaroleW]

Segar & Cadnass - makes a change from John & Mary😂

I see she signed the 1914 marriage cert as Cadnass Ann

[Gadget]

I've not come across it before ~

 Cadi and Caris/Carys are the only names that I know of that are close to it:
~

Here she is on the baptism record of one of their children:

[CaroleW]

She died 1980 - reg shows her as Cadnus Ann Blackburn

[Mabel Bagshawe]

Don't know anyone called Cadnass either, although I do know a Ninnis family

[CaroleW]

1954 Electoral register for Goitre Coed Rd shows her as  Cadnas A Blackburn

She is in Glamorgan in 1939 but Segar is in Monmouth.  Originally transcribed as Cadens but a correction was notified in 2021

[Gadget]

This site offers Custance/Constance as possible

https://www.whatsinaname.net/php/search.php?action=search2&search_name=~cadnas

[hanes teulu]

Did wonder if it was based on "Cadnoes" or "Cadnawes" ie. a female fox.

[Gadget]

Is there a female form of Cadwaladr ?

PS or a possible Cad-nerys  -