Every otaku producer on any at least decently-sized project is chained to very BIG MONEY merch contracts. Merch sales are one of the biggest cogs making the anime industry run and because of that, merch manufacturers expect producers not to allow anything that would make their products fail to reflect the contents of the show.
A recent example that sparked controversy about this is the new Tokyo Mew Mew reboot anime. Mew Mew is a series where pretty much everyone important has food names, but the early scanlators failed to notice how far this motif extended and rendered Quiche's name as Kisshu. This is spread in the fandom enough to make merch makers assume that was the proper way to spell his name in English and produce pins with the name Kisshu written in Roman letters. Thanks to that, over a decade later, the Mew Mew translator on Crunchyroll subs is forced to use Kisshu on her script despite knowing it's wrong.
But this is a Type-Moon post, so let's talk about Type-Moon instead. On October 29th, 2010, Nasu released Fate/complete material III, containing profiles for all Servants featured in Fate/stay Night. In his lack of English knowledge, he most likely relied on Google to learn how to romanize all those names. This generated two curious results: Arthuria was rendered as Altria, as the first search result for アルトリア would be the cigarette corporation, and Rider favored the French spelling Medousa over the English Medusa.
Flash forward to May 25th, 2016. At this year, Fate/Grand Order had already been released and proved itself a commercial success against all odds. In celebration of that, FuRyu Corporation sculpted the source of all evil.
FuRyu's figure utilized the erroneous "Altria" from Complete Material III. Here is where I want you to notice that FuRyu did not release a Medusa figure alongside it. "Altria Pendragon" is the only character in this collection.
Our next chronological stop is August 14, 2016. Merely 3 months after the FuRyu Altria figure began to spread its corruption through all we know and love. That's the day Fate/Grand Order Material I came out, containing profiles for Saber Arthuria and Medusa.
As you can see in the right corner, Medousa is no more. Due to having 6 more years to learn things and no merch contract forever chaining him to his spelling mistake, Nasu had the opportunity to correct Medusa's name, which also settled it as the name FGO NA legally had to go with.
So when I say FGO NA translators went with Tam Lin because it's literally illegal not to do so, I am talking about
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