Keshab Kr Sarkar is concerned about the variation between 'Kr' and 'Kumar' in his name and his father's name across different documents, including birth certificates, Aadhaar, PAN, and educational certificates. Experts advise that these discrepancies could lead to future problems and recommend obtaining a Gazette Notification through the Tahsildar to officially correct the names. While some believe 'Kr' is commonly understood as 'Kumar' for surnames, it's best to address the mismatch proactively.