I have an idea about the names of Jmen. Tell me if someone has already said it.
First part of the name is always a number, second is a creature a lot and each type appears several times, and third is a description of something (sometimes words).
I think the first two parts are a date of birth. The number shows the day of the second part which could be a month or year (year of the tiger sort of thing).
The last part is the one that seems to be most confusing. But it isn't.
Native Americans used to name their children by the first thing they saw after the child was born. I think this is the same for JMen, perhaps being named for the first thing they saw after they became Heron Guard. It makes sense if you look at them using Fear.