Yngvi, Old High German Inguin and Old English Ingƿine are names that relate to a theonym which appears to have been the older name for the god Freyr. Proto-Germanic *Ingwaz was the legendary ancestor of the Ingaevones, or more accurately Ingvaeones, and is also the reconstructed name of the Elder Futhark rune ᛜ and Anglo-Saxon rune ᛝ, representing ŋ.
A torc, the so-called "Ring of Pietroassa", part of a late third to fourth century Gothic hoard discovered in Romania, is inscribed in much-damaged runes, one reading of which is gutanī [i(ng)]wi[n] hailag "to Ingwi[n] of the Goths holy".
Old Norse Yngvi as well as Old High German Inguin and Old English Ingƿine are all derived from the Proto-Germanic *Ingwaz. Sound changes in late-Proto-Germanic transformed *Ingwaz into *Ingwi(z) in the nominative case and *Ingwin in the accusative case. That his epithet *Fraujaz appears in Old Norse compounds Ingvifreyr and Ingunarfreyr, as well as in Old English fréa inguina, both of which mean 'Lord of the Inguins', i. e. the god Freyr, strongly indicates that the two deities are either the same or were syncretized at some very early period in the Germanic migration (or possibly before). The Ingvaeones, who occupied a territory roughly equivalent to modern Denmark, Frisia and the Low Countries at the turn of the millennium, were mentioned by Pliny the Elder in his Natural Histories as one of "five Germanic tribes". Tacitus asserts their descent from the three sons of Mannus or *Mannaz, the Proto-Germanic 'first man', of whom *Ingwaz may have been one. Other names that retain the theonym are Inguiomerus or Ingemar and Yngling, the name of an old Scandinavian dynasty.
The ŋ rune (with variants and ) together with Peorð and Eihwaz is among the problematic cases of runes of uncertain derivation unattested in early inscriptions. The rune first appears independently on the futhark row of the Kylver Stone, and is altogether unattested as an independent rune outside of such rows. There are a number of attestations of the i͡ŋ bind rune or (the "lantern rune", similar in shape to the Anglo-Saxon gēr rune ᛄ), but its identification is disputed in most cases, since the same sign may also be a cipher rune of wynn or thurisaz. The earliest case of such an i͡ŋ bindrune of reasonably certain reading is the inscription mari͡ŋs (perhaps referring to the "Mærings" or Ostrogoths) on the silver buckle of Szabadbattyán, dated to the first half 5th century and conserved at the Hungarian National Museum in Budapest.
The Old English rune poem contains these obscure lines:
In Norse mythology, Yngvi, alternatively spelled Yngve, was the progenitor of the Yngling lineage, a legendary dynasty of Swedish kings, from whom also the earliest historical Norwegian kings claimed to be descended. Yngvi is a name of the god Freyr, perhaps Freyr's true name, as freyr means 'lord' and has probably evolved from a common invocation of the god.
In the Íslendingabók (written in the early twelfth century by the Icelandic priest Ari Þorgilsson) Yngvi Tyrkja konungr 'Yngvi king of Turkey' appears as the father of Njörðr who in turn is the father of Yngvi-Freyr, ancestor of the Ynglings. According to the Skjöldunga saga (a lost epic from 1180–1200, saved only partially in other sagas and later translation) Odin came from Asia and conquered Northern Europe. He gave Sweden to his son Yngvi and Denmark to his son Skjöldr. Since then the kings of Sweden were called Ynglings and those of Denmark Skjöldungs.
In the Gesta Danorum (late twelfth century, by Saxo Grammaticus) and in the Ynglinga saga (ca. 1225, by Snorri Sturluson), Freyr is euhemerized as a king of Sweden. In the Ynglinga saga, Yngvi-Freyr reigned in succession to his father Njörðr who had – in this variant – succeeded Odin. In the Historia Norwegiæ (written around 1211), in contrast, Ingui is the first king of Sweden, and the father of a certain Neorth, in his turn the father of Froyr: "Rex itaque Ingui, quem primum Swethiæ monarchiam rexisse plurimi astruunt, genuit Neorth, qui vero genuit Froy; hos ambos tota illorum posteritas per longa sæcula ut deos venerati sunt. Froyr vero genuit Fiolni, qui in dolio medonis dimersus est […]"
In the introduction to his Edda (originally composed around 1220) Snorri Sturluson claimed again that Odin reigned in Sweden and relates: "Odin had with him one of his sons called Yngvi, who was king in Sweden after him; and those houses come from him that are named Ynglings." Snorri here does not identify Yngvi and Freyr, although Freyr occasionally appears elsewhere as a son of Odin instead of a son of Njörðr.
In the Skáldskaparmál section of his Prose Edda Snorri brings in the ancient king Halfdan the Old who is the father of nine sons whose names are all words meaning "king" or "lord" in Old Norse, as well as of nine other sons who are the forefathers of various royal lineages, including "Yngvi, from whom the Ynglings are descended". But rather oddly Snorri immediately follows this with information on what should be four other personages who were not sons of Halfdan but who also fathered dynasties, and names the first of these again as "Yngvi, from whom the Ynglings are descended". In the related account in the Ættartolur "Genealogies" attached to Hversu Noregr byggðist, the name Skelfir appears instead of Yngvi in the list of Halfdan's sons.
The Ynglinga Saga section of Snorri's Heimskringla (around 1230) introduces a second Yngvi, son of Alrekr, who is a descendant of Yngvi-Freyr and who shared the Swedish kingship with his brother Álf (see Yngvi and Alf).
The element Ing(o)- was widely used in Germanic names from an early period; it is not clear whether it originally referred to the Ingaevones, or to the god Yngwi directly. Inguiomer was a relative of the Cheruscan Arminius in the first century. Ingundis was a wife of the Frankish king Chlothar I, whose son Charibert I married an Ingoberga (all in the sixth century). Other combinations such as masculine Inguin, Ingulf, Ingobald, feminine Inghildis, Ingedrudis, Ingoflidis, as well as the short forms Ingo (masculine) and Inga (feminine) are recorded in the early medieval period (seventh to ninth centuries). In Scandinavia and Germany, and areas where these groups settled, names beginning with Ing survived into modern usage, e.g.Ingmar, Ingvar, Ingvild, Ingeborg, Ingrid, Ingegerd and the family name Ingalls.
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