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Select/Activate the worksheet that you want to rename.
Choose the option SHEET from FORMAT menu and then choose RENAME.
Or click on Sheet Rename option from customized tab.
Or click on Rename Sheet option from Format option at the Right side of the Cells option of the Home tab.
Or double click on the Sheet tab. It appears on the left bottom of the sheet.
Now type your desired name of the sheet.
Press Enter button.