Form I-90 has three fields where you are required to enter your name in the Part 1 Personal Information. You must enter your full name. You must not write only initial letters; instead, spell out the entire words. Write your last name, also called a family name or surname, in the field 3.a. Also write your first name (a given name) in the field 3.b. If you have a middle name, you should write it in the field 3.c. Otherwise, write N/A (not available) if you do not have a middle name.
Note that the full name you write into the Form I-90 application must be exactly how it is printed on your green card. In the event your name was changed, follow to the article “What if my name has changed since my existing green card was issued?”