Also, there are some unusual nicknames to
Katherine, like
Terry, Karri, etc. I absolutely don't understand why so many people hate nicknames(
Have you considered Margaret/Margot?
Diana? Marianne/Marion?
My top recommendatoon: Marianne/Marianna
If you dislike nicknames, it can easily go without them. If you love nicknames,
Marianne has options beyond
Mary and
Anne. Rianne/Rianna,
Mira,
Annemarie, Rennie/Renny,
Remy.
If you use
Marion, there's
Romy,
Riona,
Mona (
Marianne has a closer vibe to
Katherine and
Alexandra, though).
P.S. I know this was NOT helpful.