Yes. In Hungarian, 'sz' is pronounced as an 's' as in 'lasso' and not with a 'z' sound. The character is from Czechoslovakia (now two independent countries, Czechia or the Czech Republic and Slovakia). Before WWI and the Treaty of Trianon, there was no such country as Czechoslovakia, as it was part of the Austro-Hungarian Empire. In fact, the very name itself, 'Laszlo', is a quintessentially Hungarian (Magyar) name: Saint Lászlo was the third king of Hungary, from 1077 to 1095 (under a constitutional monarchy established in 1000 AD).