Can I legally change my name to a hispanic name even if I am not of hispanic orgin?

You can apply to the court for a name change to any name you want, as long as you are not defrauding creditors or others, or escaping from the law.  The court may deny the name change if there appears to be an ulterior or illegal purpose. or if granting it will potentially invade the property rights of others.  Be prepared to have a valid reason to change your name to a hispanic name.