Quote Originally Posted by ShakeyX View Post
So I dunno if this was an error but as I highlighted (underlined in the above quote) it says it is applied to given names AND nouns that end in -a -я... I don't know if they meant NAMES rather than NOUNS but if so... what animate/inanimate objects can you use the vocative in, and how does the vocative work on male names for example my name Джейк!
It is appliable to both given names and nouns ending in -а or -я.

Vocative is used to call someone so it is applicable to animate objects that can (potentially) react to your call. Neo-vocative has no specific form for Джейк, because Джейк does not end in -а or -я.

Male names:
(Nominative - Neo-Vocative)
Данила - Данил
Витя - Вить
...