A Hungary?/Serbia? Puzzler

The cancels on these early Hungarian stamps read "FELSO JREGH" and "FELSOIREG", probably two ways the name of the same town was expressed.
"Felso" is a Hungarian prefix for "Upper."
There was in Hungary a town named Ireg, which is now in Iregszemcse. And there was a town in a part of Serbia that was in the Austro-Hungarian Empire which the Hungarians called Ireg. It is now Irig, Serbia.
So which one of them had an "Upper Ireg"?
My sources don't answer the question and I would appreciate any help with this puzzler.

Iregszemcse was formed by the merger of the Hungarian villages of Felso-Ireg and Szemcséd in 1938.

As Classic_Paper said, from Wikipedia: "Felsoireg, Tolna County, today part of Iregszemcse, which was established from the merger of Felsoireg and Szemcséd in 1938".
Given that the stamps are Hungarian, I'd go with the Hungarian, rather than Serbian, option.

edit: Felso, with two umlauts or whatever above the "O". The site allows to write "E" with one umlaut, but not two.

Thank you. Looks like they belonged to the Hungarian town. None of my sources had a "Felso" attached to the "Ireg."

It wasn't found directly in Wikipedia. As for "ireg" - google translate gives an odd translation, "sob". So, "upper weeper village"?

An umlaut is the two dots. Two umlauts would be four dots, which AFAIK doesn't exist in any language.
The single, hollow dot above some letters in some Nordic languages is called an overring.

The Hungarian alphabet contains the umlaut vowels ö and ü, as well as the corresponding long umlaut vowels, which have a double acute accent instead of a double dot. This is what appears in the place name Felso. (These characters are not supported on this site.)

https://en.wikipedia.org/wiki/Hungarian_alphabet

Thanks. So on this website we can use the ring, but not the omelet. ;)

Back to the stamps: The stamp on the right was issued in 1920 or later, and since Hungary only lost territories since WWI, most likely it's the Hungarian village.
The stamp on the left was issued before 1900. While it could have been the Serbian village of Irig (or Urog in Hungarian, with two omelets), I couldn't find any evidence that the Serbian village was also called "upper irig". In fact, since the Hungarian Irig is located Northern than the Serbian one, it may explain why the Hungarian village was called "upper".

If we can't use them here, how did you manage to show the omeleted O and U?

Thank you all.

Normal umlaut characters, found in Hungarian, German, Finnish, Icelandic, Swedish, Turkish, etc., are supported on this site: ä, ö, ü. The long umlauts of Hungarian, which use double acute accents rather than double dots, however, are not supported and show up like this: #337;, #369;.

https://en.wikipedia.org/wiki/Double_acute_accent