• naria mitchell,
• karia mitchell,
• jaria mitchell,
• mzria mitchell,
• msria mitchell,
• mwria mitchell,
• mqria mitchell,
• maeia mitchell,
• madia mitchell,
• mafia mitchell,
• matia mitchell,
• ma5ia mitchell,
• ma4ia mitchell,
• marua mitchell,
• marja mitchell,
• marka mitchell,
• maroa mitchell,
• mar9a mitchell,
• mar8a mitchell,
• mariz mitchell

The adjective form of "Maria Mitchell" would be "Mitchellian".

The plural form of the word "Maria Mitchell" is "Maria Mitchells".

The singular form of the name "Maria Mitchell" is still "Maria Mitchell". The name doesn't change in the singular form.