I thought this was pronounced yl-vah (y being like the y in yes, a pallatisation sound with no vowel, like in the Ukrainian word йде) because I forgot how Nordic languages work. For English speakers; this name is pronounced ool-vah, but the "oo" sound being closer to the oo sound in the word "you" when an Australian or a Scottish person says it.
During my childhood, I watched a German show called "Wickie und die starken Männer" (or "Vicky the Viking"). One of the character's names is Ylva, who is the mother of Vicky.
No, Ylva is certainly not pronounced like "YOOL-va". The German Ü and the French U are not pronounced like "OO". Günther is not "gonter" in German, and the French Julie is not pronounced like the English Julie.
For English speakers; this name is pronounced ool-vah, but the "oo" sound being closer to the oo sound in the word "you" when an Australian or a Scottish person says it.