I am in the similar situation. My name is consistent in all of my documents with XXXX surname and my father's name is also consistent in all of his documents but with YYYY surname (different last name). therefore, my passport has a special remark stating that person was previously know as YYYY surname. what name type should I select from 6 options provided while submitting the application. Obviously, option 2,3, and 5 are out. I am aware that I need to submit "same name affidavit."
1. Birth
2. Nickname/Alias
3. Name before marriage
4. Former Name
5. Son/Daughter of
6. Other
In reality, I don't have a former name but just a discrepancy between my father and my last name. Different last name are due to the fact that, my cast uses two types of last name and they both pertain to the same sub-cast. This situation is very common in India.