BlackBerry Curve 8520 Smartphone by default displays the contacts name as First name and then Last name. But it also provides mobile phone users with option for changing this Display Name and this can be done using the BlackBerry Options
Press menu button in BlackBerry Smartphone and select Options from the list
In the Options screen, navigate to Language and Text Input.
In the Language and Text Input screen, navigate to Name Display option
Using the Name Display drop down values, you can set the Name Display to Last name, First name as shown below.
If you prompted with following Changes made confirmation then click Save to proceed with the changes.