This has been requested a while ago, and I finally got around to doing it! The meanings behind the different vallaslin in Origins, Veilguard, and Inquisition. Disclaimer: Origins' (and thus also DA2's) vallaslin is technically an educated guess, but most vallaslin are either 1:1 the same or nearly the same as in DAI and DAVe, or have lore / development indicators as to why they are for certain gods.
This means that the first row of Origins' vallaslin is rather obvious, while the second row is the more tricky one. Sylaise is easy because "she brought [the elves] fire" (Codex entry: Sylaise: the Hearthkeeper). Meanwhile, Mythal's tattoo can be put down due to the fact that Merrill's vallaslin is a variation of Mythal's designs (according to Mary Kirby), and shares many similarities with the very last ones in the second row, which she wore in Origins.
While all three designs and their complex variations (Mythal, Ghilan'nain, Dirthamen) share some similarities (in my heart, Ghilan'nain's design will always be Mythal's as it looks the most like DAI's and DAVe's to me), we can still put down their respective gods. Dirthamen's design shares some similarities with Falon'Din's, which makes sense, as they are twin gods. Meanwhile, Ghilan'nain's design looks like halla horns - and she is, after all, the Halla-Mother.
As for companions pre-Veilguard, Merrill's vallaslin is Mythal, Velanna seems to be Ghilan'nain, and Marethari, albeit not a companion, changes from Sylaise to Dirthamen. Bellara's vallaslin is also a variation of Dirthamen, according to John Epler. Bonus: Fenris' markings look similar to June's vallaslin, and Davrin's vallaslin might be a variation of Mythal's.
Finally, as we do not have any confirmation for the DAO designs of Mythal, Dirthamen, and Ghilan'nain, I'd like to add that it is completely plausible for different clans to interpret them as belonging to different gods. After all, Dalish culture is not set in stone, but rather in re-tellings.
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