There existed Mano and Laszlo Latzkó, apparently court jewelers in late 19th century Budapest.
The information was gleaned from:http://adatbazisokonline.hu/en/adatbazi ... tlap/59101
further search yielded the writer Andreas (Andor) Latzko (1876-1943)https://en.wikipedia.org/wiki/Andreas_Latzko
He is mentioned as "son of the downtown jeweler" in this treatise on Budapest coffee house society at the turn of the century.http://epa.oszk.hu/00000/00003/00026/saly.html
Hopefully, one our Hungarian speaking forum members can dig up some definitive information.