Speakers of all languages pepper their listeners with fillers, those sounds and words that take up little space and allow the speakers to figure out where they’re going. Here are some language-specific fillers:
Britain— spelled er (but pronounced uh)
Israel (Hebrew speakers)—ehhh
Holland—uh and um
Germany—ah and ahm
Serbia and Croatia—ovay
Sweden—eh, ah, aaah, m, mm, hmm, ooh, a and oh (very creative, no?)
Norway—e, eh, m, hm
Sometimes fillers are more than just a sound; they are complete words:
English speakers— well, you know, I mean, so
Turkey—shey, shey shey, which means thing
Mandarin Chinese—neige, meaning that
Cantonese speakers in Hong Kong—tsik hai, which means equal
Wichita Indian—kaakiri, meaning something
It seems that um is ubiquitous, found in every language.
My information comes from, um, the book titled Um, written by, um, Michael Erard.