I did a quick search. Names were named by him here [1] in 2024 - but not as successors per se. More like candidates for important roles in the future. This [2] interview from 2020 touches the subject as well.

I interpret it in a way that he tries to cultivate an environment where a good leader/successor/main-whatever emerges somewhat naturally.

[1] https://lwn.net/Articles/990534/ [2] https://itwire.com/business-it-news/open-source/torvalds-say...

(Prime example of my personal behavior which I really don't like: Put a half-baked assumption/hearsay on the internet. Get 2 replies. Start actually researching the topic only afterwards.)