I was wondering how I can learn more about some of the angels named in the anime Neon Genesis Evangelion. In the show, "angels" are mostly just monsters, but they're apparently named after real figures from Jewish/Christian/Islamic mythology and it got me curious about the "real" versions of these characters. Unfortunately, most of these angels are obscure as fuck and 99% of the material I can find about them is about the NGE versions. Does anyone know where I can find more information about these ? What ancient documents or stories are they mentioned in?
Their names are Sachiel, Shamshel, Ramiel, Gaghiel, Israfel, Sandalphon, Matarael, Sahaquiel, Iruel, Leliel, Bardiel, Zeruel, Arael, Armisael, and Tabris. Some of them have a lot of alternate spellings though (another thing that makes research hard.) Some of them have short wikipedia articles, but most don't lead to primary sources, which is what I really want to find. Just wondering if anyone here knows a lot of angel lore and could help me out.
Sorry if this is considered lame or off-topic, I just don't know of a more appropriate board to ask about this that isn't beyond dead.