The term wolþu- "glory", possibly in reference to the god, is attested on the 3rd century Thorsberg chape (as owlþu-), and there are many placenames in Ullr and a related name, Ullinn, but medieval Icelandic sources have only sparse material on the god Ullr. The medieval Norse word was Latinized as Ollerus. The Modern Icelandic form is Ullur. In the mainland Scandinavian languages the modern form is Ull.
The Old English cognate wuldor means "glory" but is not used as a proper name, although it figures frequently in kennings for the Christian God such as wuldres cyning "king of glory", wuldorfæder "glory-father" or wuldor alwealda "glorious all-ruler".
owlþuþewaz / niwajmariz
The first element owlþu, for wolþu-, means "glory", "glorious one", Old Norse Ullr, Old English wuldor. The second element, -þewaz, means "slave, servant". The whole compound is a personal name or title, "servant of the glorious one", "servant/priest of Ullr". Niwajmariz means "well-honored".
In Lilla Ullevi ("little shrine of Ullr") north of Stockholm archaeologists excavated during 2007 the site of a religious worshiping ground for Ullr (from 500 to 800 AD).  The well-preserved state of the shrine may be unique in Scandinavia: it was shaped like a platform with two "arms" of rocks having four erected poles in front of it where there was probably a wooden platform. Moreover, the archaeologists found 65 "amulet rings" in the area; rings are reported to have been used when people swore oaths. They may be the rings of Ullr that are referred to in the eddic poem Atlakviða.
When Odin was exiled, Ollerus was chosen to take his place. Ollerus ruled under the name Odin for ten years until the true Odin was called back, whereupon Ollerus retired to Sweden where he was slain by Danes.
Ullr is mentioned in the poem Grímnismál where the homes of individual gods are recounted. The English versions shown here are by Thorpe.
The name Ýdalir, meaning "yew dales", is not otherwise attested. The yew was an important material in the making of bows, and the word ýr, "yew", is often used metonymically to refer to bows. It seems likely that the name Ýdalir is connected with the idea of Ullr as a bow-god.
Another strophe in Grímnismál also mentions Ullr.
The strophe is obscure but may refer to some sort of religious ceremony. It seems to indicate Ullr as an important god.
The last reference to Ullr in the Poetic Edda is found in Atlakviða:
Both Atlakviða and Grímnismál are often considered to be among the oldest extant Eddic poems. It may not be a coincidence that they are the only ones to refer to Ullr. Again we seem to find Ullr associated with some sort of ceremony, this time that of swearing an oath by a ring, a practice associated with Thor in later sources. During an excavation in 2007, of a Vendel era shrine for Ullr north of Stockholm, many symbolic rings were discovered, which are considered to represent Ullr's ring (see the archaeology section above).
In chapter 31 of Gylfaginning in the Prose Edda, written in the 13th century by Snorri Sturluson, Ullr is referred to as a son of Sif (with a father unrecorded in surviving sources) and as a stepson of Sif's husband; the major Germanic god Thor:
In Skáldskaparmál, the second part of the Prose Edda, Snorri mentions Ullr again in a discussion of kennings. Snorri informs his readers that Ullr can be called ski-god, bow-god, hunting-god and shield-god. In turn a shield can be called Ullr's ship. Despite these tantalising tidbits Snorri relates no myths about Ullr. It seems likely that he didn't know any, the god having faded from memory.
Snorri's note that a shield can be called Ullr's ship is borne out by surviving skaldic poetry with kennings such as askr Ullar, far Ullar and kjóll Ullar all meaning Ullr's ship and referring to shields. While the origin of this kenning is unknown it could be connected with the identity of Ullr as a ski-god. Early skis, or perhaps sleds, might have been reminiscent of shields. A late Icelandic composition, Laufás-Edda, offers the prosaic explanation that Ullr's ship was called Skjöldr, "Shield".
The name of Ullr is also common in warrior kennings, where it is used as other god names are.
- Ullr brands – Ullr of sword – warrior
- rand-Ullr – shield-Ullr – warrior
- Ullr almsíma – Ullr of bowstring – warrior 
Ullr's name appears in several important Norwegian and Swedish place names (but not in Denmark or in Iceland). This indicates that Ullr had at some point a religious importance in Scandinavia that is greater than what is immediately apparent from the scant surviving textual references. It is also probably significant that the placenames referring to this god are often found close to placenames referring to another deity: Njörðr in Sweden and Freyr in Norway. Some of the Norwegian placenames have a variant form, Ullinn. It has been suggested that this is the remnant of a pair of twin gods and further that there may have been a female Ullin, on the model of divine pairs such as Fjörgynn and Fjörgyn.
- Ullarhváll ("Ullr's hill") - name of an old farm in Oslo.
- Ullarnes ("Ullr's headland") - name of an old farm in Rennesøy.
- Ullarøy ("Ullr's island") - name of four old farms in Skjeberg, Spind, Sør-Odal and Vestre Moland.
- Ullern (Ullarvin) ("Ullr's meadow") - name of old farms in Hole, Oslo, Ullensaker, Sør-Odal and Øvre Eiker.
- Ullinsakr ("Ullin's field") - name of two old farms in Hemsedal and Torpa (old church site).
- Ullinshof ("Ullin's temple") - name of three old farms in Nes, Hedmark (old church site), Nes, Akershus and Ullensaker (old church site).
- Ullinsvangr ("Ullr's field") - name of an old farm in Ullensvang (old church site).
- Ullinsvin ("Ullin's meadow") - name of an old farm in Vågå (old church site).
- Ullsfjorden ("Ullr's Fjord") - fjord in Troms county. Commonly believed to be named after Ullr, although there is some uncertainty.
(For a possible nickname *Ringir for Ullr see under the name Ringsaker.)
- Ulleråker ("Ullr's field") Uppland
- Ultuna ("Ullr's town") Uppland
- Ullared ("Ull's clearing?") Halland
- Ullevi ("Ullr's sanctuary") Västergötland
- Ullvi ("Ullr's sanctuary") Västmanland
- Ullene ("Ullr's meadow") Västergötland
- Ullånger ("Ullr's bay") Ångermanland
- Ullen Värmland, Hagfors springsource lake
- Ullbro ("Ulls bridge") Uppland, Enköping
- Ullunda ("Ulls grove") Uppland, Enköping
- Ullstämma ("Ulls meeting") Uppland, Enköping
- Värmullen Värmland, Hagfors
- Ullsberg ("Ull's mountain") Värmland, Hagfors
In Viktor Rydberg's idiosyncratic Teutonic Mythology Ullr is the son of Sif and Egill-Örvandill, half-brother of Svipdagr-Óðr, nephew of Völundr and a cousin of Skaði. His father, Egill, was the greatest archer in the mythology, and Ullr follows in his father's footsteps. Ullr helped Svipdagr-Eiríkr rescue Freyja from the giants. He also ruled over the Vanir when they held Ásgarðr during the war between the Vanir and the Æsir.
While most of Rydberg's theories are dismissed as fanciful by modern scholars his idea that Ullr is connected with the elves of Völundarkviða is not absurd. Both seem associated with skiing and hunting and since Ullr's father is not identified as one of the Æsir he may have been of another race.
Within the winter skiing community of Europe the Old Norse god "Ullr" is considered the Guardian Patron Saint of Skiers (German Schutzpatron der Skifahrer). An Ullr medallion or Ullr ski medal, depicting the Scandinavian god Ullr on skis holding a bow and arrow, is widely worn as a talisman by both recreational and professional skiers as well as ski patrols in Europe and elsewhere.
The town of Breckenridge, Colorado hosts a week-long festival called "Ullr Fest" each year in January, featuring numerous events designed to win his favor in an effort to bring snow to the historic ski town. Breck Ullr Fest was first held in 1962.
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Ullr is the only deity in the human pantheon who was traditionally represented on skis. Ullr has gained reverence among ski mountaineers in North America and is honoured in good humour for bountiful snowfall.
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- Saxo Grammaticus, Gesta Danorum, Books I-IX, translated to English by Oliver Elton 1905.
- Saxo Grammaticus, Gesta Danorum, from the Royal Library in Copenhagen, Danish and Latin.
- Snorri Sturluson ; translated by Jean I. Young (1964). The Prose Edda : Tales from Norse mythology. Berkeley: University of California Press. ISBN 0-520-01231-3.
- Thorpe, Benjamin. (Trans.). (1866). Edda Sæmundar Hinns Froða: The Edda Of Sæmund The Learned. (2 vols.) London: Trübner & Co. 1866. (HTML version available at Northvegr: Lore: Poetic Edda - Thorpe Trans.)