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Around the world, Ulfr (Ylva , Ulv , Ulfr) is quite a rare feminine first name. The first name Ulfr is habitual in Northern Europe, particularly Sweden, where it is quite a common girly name, Norway, where it is a rare feminine name, and Finland. Measured by absolute frequency, it is commonest in Sweden, Germany, and the United States. Much less frequently, Ulfr is the last name as well as the forename.
Ulfr is also a name for the fictitious and mythical characters: Ylva , the fictional character from Vicky the Viking.