This is the 804th most frequent Tamil word.
எவன
"எவன" means "who" or "which person" in English.
The word 'எவனுடைய' (evanudaiya) is used here to refer to possession, meaning 'whose'.
எவனுடைய புத்தகம் இது?
Whose book is this?
The word 'எவனும்' (evanum) in this sentence means 'no one', indicating absence or negation in a collective sense.
எவனும் வரவில்லை.
No one came.
Here, 'எவனென்று' (evanenru) emphasizes 'who', forming an indirect question.