First off, the Romans spoke Latin. In Latin, if you want to say hi to one person you say "salve" (pronounced "sol-way"), but if you want to say hi to multiple people you say "salvete" (pronounced "sol-way-tay").
The origins of the word "hi" are not attributed to any specific person. It likely evolved over time as a shortened form of the word "hello."
You say "Sawbona!" if you are saying hello or hi to one person. But you say "Sanibona!" if it is being said to more than one person.
Because when you first meet someone, you say hi out of habit.
In Konkani, you can say "नमस्कार" (Namaskar) to greet someone and say hi.
hi
hi is a way of being friendly when you don't say hi it means you must not be friendly at least to that person
Billy Crewman
Usually, it depends on the person
you say hi im (your name)
In Wolof, you can say "Nanga def?" to greet someone, which translates to "How are you?". It is a common way to say hi and ask how the person is doing.
The word hi exists because what else will you say to a person when you meet them or see them. Are you going to say bye hahahaha!