Common spellings:
* Katherine: The most common spelling in English-speaking countries.
* Catherine: A variation commonly used in English, French, and other European languages.
* Katerine: An uncommon spelling, but still considered acceptable.
Less common spellings:
* Katherin: This is a simplified spelling of Katherine.
* Katharine: An older, more formal spelling of Katherine.
* Katerina: A Greek spelling, often used in Eastern European countries.
* Katarina: A Croatian and Serbian spelling.
* Catarina: A Portuguese spelling.
* Caterina: An Italian spelling.
Other variations:
* Katt: A nickname, sometimes used as a formal name.
* Kate: A common nickname, sometimes used as a formal name.
The best spelling to use will depend on personal preference and the context in which the name is being used.