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.
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.