Sindarin for name used by dear friends?

People often have names that are used on formal occasions or by strangers or acquaintances. And they may have names, typically shortened ones or nicknames, that are only used by their dear friends.

Examples:

Samantha (f) might be Sam. Samuel (m) might be Sam or Sammy. Someone who got their growth well after their friends might be called Shorty.

Perhaps eneth mellon, meaning friend's name?