Latvianisation of names is rife and occurs automatically.
When I married here - my English Surname - which goes back hundreds of years was Latvianised on the Marriage Certificate.
The Dept offered to state both English and Latvian versions on it - but what actually happened was it Latvianised BOTH ...
What should have been Svetlana Luther if married in UK was agreed to be :
Svetlana Lutere (Luther)
but certificate actually reads :
Svetlana Lutere Lutere
I wish you luck ....
The strange thing is - my Residence Permit has my full ENGLISH name on ... without Latvian version.