Love this name. I might use it as a girl's name actually. It's for a character in a book, and the character isn't right in the head. So this name is good for her.
I don't think "jaro" means "spring"; an adjective "jary" means "fierce" in some Slavic languages, so Jarogniew should show a "great wrath" to his enemies, such as Casimir should "destroy their peace" (see CASIMIR). Names like this are an inheritance of a time when the Slavs were ferocious warriors.
Yes, we do have names with "anger", like Zbigniew. But the truth is that most of the names from this list come from Middle Ages and actually don't exist anymore.