From a previous reading I thought I had a reference that many Greeks had converted or entered into Jainism, too. I can't refind what I had in mind but maybe an older writing is also of some interest; from The Greeks In Bactria And India by W. W. Tarn, 1938, p. 391 "... but in fact at present there are only five Greeks whose religious predilections are known or can be deduced, and three of these were not Buddhists...." in https://archive.org/details/in.ernet.dli.2015.282142/page/n413/mode/2up