I have seen a lot of questions regarding variations in the big avalanche joseki. I have made a video about big avalanche's most common variation before and hope this is helpful

https://www.youtube.com/watch?v=K9uoZtlZYhM

Is that the same as the onadare? I never can get the English names straight.

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Still officially AGA 5d but I play so irregularly these days that I am probably only 3d or 4d over the board (but hopefully still 5d in terms of knowledge, theory and the ability to contribute).

Yes

I simply learned the Japanese names for all the joseki long before the English names, so they come naturally to me. The English names are like a foreign language. The only books available when I started to play used the Japanese names. I still think in terms of shimari and kakari instead of enclosure and approach.

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Still officially AGA 5d but I play so irregularly these days that I am probably only 3d or 4d over the board (but hopefully still 5d in terms of knowledge, theory and the ability to contribute).

I once read a book and it started saying things like "When black plays the ikken takabasami..." and it's just too dense to read like that constantly even if I can understand it.

"Ikken Takabasami" is just as easy to me as "One point high pincer" and used to come just as naturally. Nowadays, with all the online material I am used to the English so will use it. But I cannot remember the last time I heard "big avalanche" so that does not come as easily as onadare.

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Still officially AGA 5d but I play so irregularly these days that I am probably only 3d or 4d over the board (but hopefully still 5d in terms of knowledge, theory and the ability to contribute).

This is very familiar to me.

But -- as a German -- I think in terms of "Shimari", and "Kakari".

However, during writing my books on Igo Hatsuyôron, I had to learn that "shimari", and "kakari", would suite native English eyes much better.

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The really most difficult Go problem ever: https://igohatsuyoron120.de/index.htm
Igo Hatsuyōron #120 (really solved by KataGo)

"Enclosure" and "Approach" feel more natural to me.

Words like shimari, kakari, nobi for me fall into the category where both sound equal, but things like hasami definitely do not.

It has been said before that go terms are technical words with specific meanings that might be different from the everyday meanings. I am picking nits here but I think "enclosing move" is better than "enclosure" since after a shimari move the corner is often still vulnerable to invasion. I learned go in Japan almost 60 years ago. The first serious English go books I encountered were the first editions of the Ishi Press books like Basic Techniques, Strategic Concepts, and Sakata's Middle Game of Go, in which Japanese terms were heavily used. I knew all the terminology so, of course this usage didn't bother me. I have friends who did not know Japanese and used these books and they, too, had no trouble with the terminology. They just treated them as special terms that they had to learn, just as one might have to learn a specialized terminology in any subject. The advantage is that the meaning was learned from the practical usage, not from inaccurate definitions in a different language.

Those are exactly the same books I learned from and are the reason I am comfortable with the terminology. That is all there was back then. I later studied Japanese and that reinforced it all.

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Still officially AGA 5d but I play so irregularly these days that I am probably only 3d or 4d over the board (but hopefully still 5d in terms of knowledge, theory and the ability to contribute).

Most of my books are Japanese, so I am comfortable with all the terminology. When I teach, I try to use as much English as possible. It just feels easier to help people pick up the game and make it less strange.

I agree with this, but that does not make it more natural. I cannot remember the last time I heard anyone call it the avalanche joseki and my initial query was genuine. Do you use "taisha" or "great slant"? I don't think I have ever heard the latter.

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Still officially AGA 5d but I play so irregularly these days that I am probably only 3d or 4d over the board (but hopefully still 5d in terms of knowledge, theory and the ability to contribute).

I usually use avalanche. I do use taisha but it rarely comes up

The simple solution to this is not to play the joseki at all.

I don't think English or Japanese terminology matters that much in reality. if you don't know what a word/term means, even if that term is in English, why should it be any harder to learn the meaning from an explanation?