About the Syrian thing, in Russia, all sources refer to the Seleucid Empire as the Syrian Empire or the Syrians. What about Netherlands? What is it called there?

And yes, because the heartlands of Seleucia were in Syria, and because by the alter times, they have lost much of their holdings except Syria, the Seleukids are called Syrians, even when they were not. Most people in US never say "USSR" or "Soviet Union", but simply call that specific entity "Russia", despite the fact that Russia was simply the main "republic" of USSR, but of course, it was not the only. The area of USSR before the breakup was 22,402,200 km² (not counting the satellite states) and Russia's area is 17,075,400 km², much of which is wilderness.