I am Sulthan from India. In India, we use the first letter of our father's first name as our initial. So in my school records my name is "A.Sulthan". On official documents, such as PAN, licence, voter ID, and Aadhar Card, I use my name alone as "Sulthan" and my father's name is written as "Ayyup Kan". For my passport, my father's name is used as my last name. So my name is written as "Sulthan Ayyup Kan".
Now I am a researcher and author. I write papers with the name "A.Sulthan" when submitting it for publication and peer review. I am confused about how I should write my first name and last name. For example, for my last name, should I use the initial "A." or ".A"? Also, I would appreciate some suggestions on using names in publication.