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hmm.. don't know why, but I considered that all names were spelled in English language, even though there are not English names.

Hey, Markarios! I am from Saratov :wink:

These are correct :)
Why are you having troubles with the other ones? Just make a simple transliteration.

Nissanka De Silva - Ниссанка Де Сильва (or Силва)
Jayatissa De Silva - Джаятисса Де...