On the 1099 form, the vendor's name appears as part of the street address
When you entered the vendor's name and address information in the New Vendor window, you changed the vendors name after QuickBooks inserted the name into the Address block. For example, you may have entered the vendor's first name as Jonathan in the First Name field and shortened Jonathan to Jon in the Address block.
On the 1099 form, the vendor's name appears in an inappropriate format
When you entered the vendor's name and address information in the New Vendor window, you left the Company Name, First Name, M. I., and Last Name fields blank. When this is the case, QuickBooks assumes that what you entered in the Vendor field is how the vendor's name should appear on the form. For example, if you entered Luxton, Brian in the Vendor field because you have organized your Vendor list alphabetically by last name, QuickBooks prints Luxton, Brian on the 1099 form.