Where does “многолюдный” come from?
многолюдный (Russian) comes from Russian лю́ди, from Proto-Slavic ľudьje, from Proto-Balto-Slavic ljaudejes, from Proto-Balto-Slavic ljaudis, from Proto-Indo-European h₁léwdʰis, from Proto-Indo-European h₁lewdʰ- — to grow; people.
многолюдный (Russian): crowded; populous
Ancestry of “многолюдный”, step by step