How much of this you take seriously is really up to you. Because of the nature of the period we are dealing with, histories were handed down by word of mouth. What written records exist are later transcriptions of those legends.

The earliest ancestral records I have been able to trace go back to the Nord Trondheim and Uppsala areas of Scandinavia. The viking settlers we originate from came across the sea to Orkney and then southwards across England. What follows is a potted history of a few of them :

Njord, King of the SWEDES, son of Yngvi, King in Turkey, was born about 214 in Noatun, Sweden.
"Njord was then the sole sovereign of the Swedes. He practiced sacrifrice, and was called the drot, or sovereign, by the Swedes. He received scatt and gifts from them. In his days were peace and plenty, and such good years in all respects that the Swedes believed Njord ruled over the growth of seasons and the prosperity of the people. In his time all the diars, or gods, died, and blood-sacrifices were made for them. Njord died on a bed of sickness, and before he died made himself be marked for Odin with the spear-point. The Swedes burned him, and all wept over his grave-mound."

Yngvi-Frey 235AD
"For many generations the kings of Upsala before King Ingjiald married for their chief wives, generally, daughters of the Royal House of Vestergothland and also married kinswomen of the royal house." These were "daughters of the drotts or kings of Ingria, in what is now Russia and Finland. "Then it was "called Yngvi Land, after Yngvi Frey the last ruler of the Swedes and Goths who was believed of divine origin."

Olaf "Trekalia" INGJALDSSON - The Wood Cutter
"Olaf, the son of Ingjald the Ill-Advised, king in Sweden, cleared Vermaland. He was called Olaf the Tree-Feller. He was fostered in West Gautland by a man named Bofi. Bofi's son was named Saxi, who was called the Plunderer. Olaf's mother was Gauthild, the daughter of King Algaut, who was the son of King Gautrek the Mild, son of Gaut, after whom Gautland is named. Alof was the mother of Gauthild, daughter of King Olaf the Clear-Sighted, king in Naeriki. At that time, Ivar Widegrasp had conquered all Denmark and Sweden, and so Olaf and a great multitude of his folk fled, and were proclaimed outlaws by King Ivar. They went north to Vaeni, and cleared the forests and settled in a large area that they called Vermaland, and the Swedes elected Olaf the Tree-Feller, and he was their king until old age."

Rognvald "The Wise" EYSTEINSSON
Earl of More and Romsdal, son of Eystein Ivarsson, and Ascrida Rognvaldsdatter, Countess of Oppland,was born about 830 in Maer, Nord Trondelag, Norway. He died in 890/894 in Orkney, Orkney Islands, Scotland. He married Ragnhild (Hilda) HROLFSDATTER about 867 in Maer, Nord Trondelag, Norway.
"On the voyage Sigurd’s brother, Earl Rognvald of More, received the Earldom of Orkney from King Harald as compensation for the loss of his son, Ivar. Rognvald had no intentions of staying in the islands so passed the Earldom on to Sigurd, who became Earl Sigurd I of Orkney."
"During his many campaigns, Harald allowed his hair to grow long and tangle into dread-locks, vowing that he would not cut his hair again until he was king of all Norway. Thus he had become known as Harald Mop-hair, at least behind his back. At first, Harald ruled primarily in the Southlands and Uplands. Jarl Hakon and his comrade, Rognvald of Mere, had originally fought against Harald Mop-hair, but eventually they realized that they had more to gain as Harald’s allies than his enemies. Harald made Rognvald Jarl of North and South Mere and of Raumdall after his victory at Solskiel over Hunthjof, King of Mere, and Nokve, King of Raumdall. When Harald had finally conquered all of Norway, it was Rognvald Eysteinsson, Mere-jarl, who cut Harald’s hair and gave him the new name, Harald Fine-hair."

Thurston le Goz was born about 989 in Normandy, France. He married Judith de MONTANOLIER about 1014.
"The third son of Gerlotte was Ansfrid the Dane, the first Vicomte of the Hiemois, and father of Ansfrid the second, surnamed Goz, above mentioned, whose son Turstain (Thurstan, or Toustain) Goz was the great favourite of Robert Duke of Normandy, the father of the Conqueror, and accompanied him to the Holy Land, and was intrusted to bring back the relics the Duke had obtained from the Patriarch of Jerusalem to present to the Abbey of Cerisi, which he had founded. Revolting against the young Duke William in 1041, Turstain was exiled, and his lands confiscated and given by the Duke to his mother, Herleve, wife of Herluin de Conteville."

Richard D' AVRANCHES, companion of William the Conqueror at the Battle of Hastings, son of Toustien le Goz and Judith de Montanolier,was born about 1025 in Avranches, Normandy, France. He died in 1066. He married Emma de CONTEVILLE.
"Richard Goz, Vicomte d'Avranches, or more properly of the Avranchin, was one of the sons of the aforesaid Turstain, by his wife Judith de Montanolier, and appears not only to have avoided being implicated in the rebellion of his father, but obtained his pardon and restoration to the Vicomté of the Hiemois, to which at his death he succeeded, and to have strengthened his position at court by securing the hand of Emma de Conteville, one of the daughters of Herluin and Herleve, and half-sister of his sovereign. By this fortunate marriage he naturally recovered the lands forfeited by his father and bestowed on his mother-in-law, and acquired also much property in the Avranchin, of which he obtained the Vicomté, in addition to that of the Hiemois."