Note: this is not a page from the book, but this is my own compilation of the sources for the names of the characters, since most of these have no info on them in English, based on the sources noted in the timeline.
The combination of the name of someone Naoko Sato liked, combined with Goichi Suda's surname, of whom Sato is a fan.
His surname is taken from the Takeuchi Document (also known as the Takenouchi Document), a book written in Jindai Script, Takenouchi no Sukune, and Take(no)uchi Kiyomaru, a scholar of Jindai Script and the first person to "discover" the documents, amongst others. "Tamon" comes from Bishamonten (also known as Tamonten), chief of the Four Heavenly Kings in Buddhism. The director also had a friend by the name of Tamon Takeuchi.
No origin given. His birth name, Takaaki Yoshimura, is taken from Takaaki Sugiura, a film critic and twin brother of Katsuaki Sugiura.
Taken from Jiro Tamiya, who played Goro Zaizen in Shiroi Kyoto (White Tower), a medical drama.
Mina's name comes from an unspecified 80s idol. The twins' surname is taken from "Yappari Neko ga Suki" (We Really Like Cats), a sitcom from the 90s, featuring three Onda sisters (Kayano, Reiko and Kimie) who share a house with their cats.
Her name comes from Harumi Yomo (四方晴美), the actress who played Chako-chan in the 60s children's show of the same name.
Taken from Reiko Kato, from "Onna Kyoshi Shiokibito" (Female Teacher Executioner).
Taken from "Matagi" (Hunter), starring a character called Heizo Sekiguchi, played by actor Ko Nishimura (his first name being written the same way as "Akira").
Not directly given. The Maeda surname is taken from "Tsumiki Kuzushi", subtitled "the two hundred day war between parents and their child", based on a true story. In the TV drama version, the father was played by Gin Maeda.
None given. However, the stage name "Mihama" is most likely an attempt to jazz up her rather plain real surname of "Tanaka", which is one of the top 5 most common surnames in the country, and may also be a reference to Naoko Amihama, an actress and singer from Hyogo.
"Kajiro" is taken from the name of a programmer with whom either Sato or Toyama used to work.
None given officially, but easily worked out. Her surname, when written using a different character for the final syllable, is written the same way as in "Yao Bikuni". The "hi" part of "Hisako" is similarly written using the first character in "bikuni". On a perhaps unrelated note, when written using different characters the "hisa" part of "Hisako" can mean "long time/eternity".
Taken from Eiji Funagoshi, the name of the actor who played Junzaburo Amagi, the kind and trustworthy principle in school drama "Nechuu Jidai".
From Tetsuo Ishidate, who played detective Shosuke Higurashi in 80s police drama "Himitsu no Deka-chan" (Secret Cop).