Most people have Eberhardus b. 816-818, but I believe he was born well before then (probably 816-818 is when he succeeded to his father, who d. 816). As father of Bego Count of Paris, he would have been born probably by 800. In fact he could be the son of the first wife of Begue Count of Paris, which would avoid a consanguinity problem for his son Bego, who married his 1st cousin Alpaide of France.
Although Ancestral Roots does not name a father of Gebhard Count of Logenahe from 832-860, it appears probable that Everhard is the father, in which case he died 832, when his son succeeded him.