If you don't have a mailing list as a source for names and addresses in a mail merge, you can create one in Word.
Note
This content applies to the desktop versions of Word. Some table features may not be available in Word for the web or mobile apps
Create a new mail merge list
On the File tab, select New and choose Blank document.
On the Mailings tab, select Select Recipients, and then select Type a New List.
In the New Address List dialog box, type recipient information in each column as appropriate. For more information about using this dialog box, go to Edit Data Source dialog.
For each new record, select New Entry.
If you need more columns, such as for an order number, follow these steps:
In the New Address List dialog box select Customize Columns.
Select Add.
Type a field name and then select OK.
Repeat steps b and c for each column or field to add.
When you're done adding all the people you want to your list, select OK.
In the Save Address List dialog box, give your new file a name, and then select Save.
You can now insert mail merge fields in your document. For more information, go to Insert mail merge fields.