Sheets in a spreadsheet can be renamed. The new name cannot:
•Contain less than 1 and more than 31 characters.
•Contain any of the following characters: (:), (\),(/), (?), (*),([), (]).
•Begin or end with a single quotation mark (').
•Repeat the name of the other sheet.
To rename a sheet:
1.Right-click the tab of the sheet you want to rename.
2. On the context menu, select .