Not to be confused with Ivan Ilyin or with Vladimir Ilyich (Lenin).
It's not clear whether Иллич (pronounced differently) is related, apparently it's used as a given name in some countries, or it might be an unrelated surname, or it might be a misspelling/mistranscription of the Russian patronym. Who knows!
He moved to Switzerland before German fasicsm turned out real bad.
French philosophers openly praised Mao and don't get me started on Heidegger...