Pax is another one that violates the rule that someone pointed out lower. Also Malm is a surname which is another violation of the rule (one of the characters in The Girl with the Dragon Tattoo was named, if I recall correctly, Stefan Malm). I remember reading the books with my then-wife and she said it was like reading an IKEA catalog. I thought she was referring to the character/place names, but it turned out that the second book had a long section where the titular girl furnishes an apartment from IKEA and—that chapter was exactly like reading an IKEA catalog.

Although "Malm" is a common surname, it's a word first and a name second if that makes sense

The same way "Brown" is common surname in English but mostly makes you think of the color first

When it comes to names like "MALM", it's likely incidental.

"Malm" is a a noun with several meanings, most notably "metal ore", but also some (more archaic) meanings like "area with sandy soil" or "city outskirts".

The fact that "Malm" also happens to be a surname is secondary; Swedish has a lot of surnames that are simply ordinary nouns or adjectives. A completely literal "No surnames, ever" rule would probably be quite a bit too restrictive. I suspect that the actual internal rule is "No names that are primarily (or solely) surnames", or something to that effect.

Malm was released in the 1980s: https://techvibeblog.com/what-is-ikea-malm-made-of/

Girl with the dragon tattoo was released in 2005

Currently 6833 people in Sweden have the last name "Malm", and some large fraction of them were born before 2005 (could not be bothered to check how many, sorry!).

I believe you, but that site reeks of LLM generated SEO junk

You’ve let your biases affect your analysis

If I remember correctly, the second book was published posthumously, and my guess is the editor's hands were tied.