Common names are easy to parse gender until they’re not. I just met an elderly man named Courtney. My niece’s legal name is “Jaime”, which is a common male name amongst Mexicans. My elementary school had a Pat of both genders. Sam as well.

Then there are names from other cultures that speak non-Germanic, non-romance languages. Good luck knowing Mandarin or Cantonese names by reading them. Same with some Irish and welsh names. Same with names from Africa.