Isabelle,
Thomas and
Ronald are decent classical names, the latter two might even be considered a bit old-fashioned.
I don't judge, but I see no point in spelling them that way, the names are still the same, they just look misspelled on paper.
P.S. I wonder whether stand-alone nickname-names are a thing in the UK, or is it an international trend?
I mean conventional NN, not the ones mentioned above.