Change the Sort Order of the ‘Select Names’ Dialog in Outlook
To change how contacts are sorted in Outlook’s Select Names dialog box:
Go to the File tab and select Info. Select Account Settings > Account Settings. Go to the Address Books tab, choose Outlook Address Book, then select Change. In the Outlook Address Books section, select the address book that you want to change the contact display format. In the Show names by section, select File As (Smith, John). Select Close. In the Account Settings dialog box, select Close. Exit and restart Outlook. Create a new email message and select the To field. The contacts are sorted in the order you selected.
Sort Your Contacts List
To change how contacts are sorted in your Contacts List:
Select the People icon in the lower left corner of the Outlook window to open your Contacts list. Go to the Home tab and, in the Current View group, select List. Select the column header for the column you want to sort. Sorting your contacts list makes it much more helpful to find individual contacts.
Format Individual Contact Names
In the Contacts list, if individual names aren’t formatted the way you like, modify the formatting.
To format individual contacts:
In the Contacts list, double-click the contact you want to format. On the Contact page, select the File as drop-down arrow and choose how the contact name should be displayed. Select Save & Close. The contact is formatted the way you’ve selected in the File As field.