How should I write or abbreviate my Indian name in academic papers?
Ultimately, consistency between papers is more important than whether it matches any of your other documents. Just pick a way you like to write it and make sure you always keep it the same in future papers.

Points to keep in mind for picking your "researcher name":


For better or for worse, anglo-saxon norms are dominant in English research publications. The closer your name looks to "Firstname [I.] Lastname", the less confusion (and hence people citing differently/wrongly) will happen. ".A", in particular, is very unusual and will likely be mistaken for a typo and "corrected" into "A." frequently.
A unique name makes your papers more easy to find. If there are already 5 people publishing under the name "Sulthan Kan", maybe pick "Sulthan Ayyup Kan" instead.