This is the 7444th most frequent Japanese word.
信秋
"信秋" is a Japanese given name, typically composed of "信" (belief, trust) and "秋" (autumn).
In this sentence, 信秋 (Shinaki) is used as a proper noun, likely referring to a person's name.
信秋さんは新しい小説を出版しました。
Mr. Shinaki has published a new novel.
Here, 信秋 is presented in quotation marks, indicating it might refer to a title, concept, or specific term.
「信秋」について何か知っていますか？
Do you know anything about 'Shinaki'?
This usage questions if anyone in the family possesses or is related to 'Shinaki', probably referring to the name.