This is the 9752nd most frequent Russian word.
эдгар
"Эдгар" is the Russian form of the male given name "Edgar."
'Эдгар' is used as a proper noun representing a person's name, indicating the subject of the sentence.
Эдгар написал интересную книгу.
Edgar wrote an interesting book.
'Эдгаром' is the instrumental case of 'Эдгар' due to its usage after 'написанную', indicating the agent of the action.
Я прочитал статью, написанную Эдгаром.
I read an article written by Edgar.
'Эдгара' is the accusative case of 'Эдгар', showing the direct object of the verb 'пригласили'.