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I've rarely seen it referred to as "WW2", as opposed to "WWII", but apparently it's been in relatively rare but consistent use in English [1] for a long time.

Tweaking the query reveals that it's relatively more common in British English than English overall, although "WWII" is more common there overall as well.

1. https://books.google.com/ngrams/graph?content=WWII%2CWW2%2CW...

2. https://books.google.com/ngrams/graph?content=WWII%2CWW2%2CW...

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> I've rarely seen it referred to as "WW2", as opposed to "WWII",

I'm an older Brit and had to think about this one but it's usually been WW2 as far as I can remember. I think the WWII is perhaps more recent or American usage.

I've just had a look and The Commonwealth War Graves Commission refers to it as WW2, or in words as "World War Two" / "Second World War"

https://www.cwgc.org/visit-us/find-ww2-war-graves/

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