I recently got my Schengen Visa from Spain and I don't have surname, so the name appearing on my passport is XXXX, ALOK KUMAR KRISHANAMURTH (the space for last "Y" was not there; my Given name on passport is Alok Kumar Krishanamurthy).
As people noted here, usually Schengen repeats names twice when there is no surname and this is the first time my name is appearing as XXXX,
In my previous Schengen Visas from France, Netherlands, Italy and Denmark, they gave my name as ALOK KUMAR KRISHANAMURTHY, ALOK KU..Shall I contact Consulate General of Spain in Mumbai why my last name is appearing as XXXX, and for missing "Y" in given name