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Ulfrun. One of Heimdal's nine giant mothers. Ulfrun.
Ullr. The son of Sif and stepson of Thor. His father is not named. He dwells in Ydaler. Uller.
Urdarbrunnr. The fountain of the norn Urd. The Urdar-fountain. The weird spring.
Urdr [Eng. weird]. One of the three norns. The norn of the past. Urd.
Utgardar [The out-yard]. The abode of the giant Utgard-Loke. Utgard.
Utgarda-Loki. The giant of Utgard visited by Thor. He calls himself Skrymer. Utgard-Loke.