Dragon blooded sorcerers are very rare, although they are said to be a bit more common in Asia. This is generally not a good choice, save for Dragonborn. Or maybe the occasional Asian with a Spirit as an ancestor (and the only Asian dragons are Gold). That being said, this is the default path on the Dragon Continent, to the West.
Wild magic: This is the default: Sorcery is a natural ability, and not well understood. The fine control just isn't there.
Storm (SCAG/Xanathar's): This is elemental blooded magic, and much more common than draconic..or it may be a gift from a sea god, especially if you're from Atlantis (where this is the default path). Storm is also the default in Araby.
Divine Soul is the default for Aasimar. Celestial Warlocks might also have descendants that are Divine Souls, but that's even rarer than the mortal offspring of Greek Deities. LosAlfar are also Divine Souls
Shadow is the default for Dokalfar.
Aberrant Mind is another Psi class, and, as such, needs await the intrusions of the Far Realm. That being said, they DO occasionally arise when around the Astrologers of Egypt. An offspring, or result of a Ritual gone wrong. That sort of thing.
Note that there IS one such intrusion Zone between Greenland and Vinland. Usually if it's even encountered at all, ships are in and out within a few minutes, but at least one ship has had cause to spend quite a bit more time in it, and it might explain some of the colony ships that just go missing. But some ships make it through with just a few disturbed dreams if anyone is sleeping at the time.
Vinland/New Wlord Vikings may choose Aberrant Mind OR Wild Mage as their bloodlines.
Clockwork Soul is the opposite of Wild Magic, and, occasionally, manifests in a Gremlin rather than the usual gift for Artifice. It is not impossible to rise elsewhere, but the rigidity of Mechanus isn't often felt in sufficient force in Midgard to imprint on someone in this way.
Playtest only, may go away:
Giant Soul Sorcerers
http://dnd.wizards.com/article.../giant-soul-sorcerer is available on a limited access for half orcs and Vikings. Troll Blooded (Half orcs) may take the Hill Mark, humans may take the Fire,Frost, or Hill mark, Hill indicating a family with troll blood in it.
This message was last edited by the GM at 20:18, Tue 04 May 2021.