No because it is an unusual spelling of a name with a perfectly acceptable phonetic spelling already.
The stress in names like Sali, Lili, Ela, Elsi and Nansi is the same as in Sally, Lily, Ella, Elsie and Nancy, but in Anabel the stress is not on the syllable stressed in Welsh.
(If they were trying to pass Ella as a Welsh name, I'd explain why it wouldn't work - 'ella' is a colloquialism for maybe and it doesn't sound like Ella. )
Well her parents and all grandparents are first language Welsh speakers, speak it all the time and not one of them mentioned it reminds them of anabl, so not a problem here.
I don't think any parent or grandparent would say something like 'This is Anabel, one N, like Anabl but with an E', would they?
You really don't like the name do you HugoThatway?!
I don't mind the name Annabel. I prefer Anna. Annabelle is a bit too frilly, Amabel isn't to my taste (I want to say it as A-mayble even though it's 'Ammabel'). I've explained why Anabel as a 'Welsh' name is problematic.
something people do when they like a non-Welsh name but want a vaguely Welsh spelling/look/use of Welsh alphabet.
What would you think of a Dsiónathan, Tsiarli, Boni or Aifi?
I don't understand why you are so defensive about it.