you can make some up...lol...
here are some that i could think of...
boys-Sayam, Sekson, Sawatchai, Sontawat, soontawee, sansaahd, siprasert, sutontan, sootrakan, sunti or sunticha/suntichon etc...
girls-Sinee, sunee, Siriam, sagee, soladasa, sunisa, shunta, sakaorut, sakaofah, sasigan...