Nobody

雲州布部住弘光作 – Unshu Fube ju Hiromitsu saku 昭和十三年二月日 – Showa 13th year (1938), 2nd month

I do not know much about it, but I think that there is a misunderstanding. Miki Yamagishi (山岸美喜) is a descendant of Tokugawa Yoshinobu family, which is one of many branch families of Tokugawa. Ref. Tokugawa Yoshinobu family - Wikipedia The Head Family of the Tokugawa Clan will continue. Ref. 徳川宗家 - Wikipedia The current head of the family is Iehiro Tokugawa (徳川家廣). Ref. Iehiro Tokugawa - Wikipedia

More precisely, 埋忠重義 – Umetada Shigeyoshi 慶長十二年八月日 – Keicho 12th year (1607), 8th month

You are almost correct. However, Kanbon 7th year is 1667.

Thank you. That was my typo.

The image is not clear, but the smith name might be 守政 - Morimasa. Edited, Mirimasa --> Morimasa

寄金 (Yosegane) FYI, 寄金 | 木目金美術館 | 杢目金屋

前田泰宏 - Maeda Yasuhiro Owner's name?

Now the auction just ended, and the tanto was sold for 180,000 JPY. The problem of the blade is much worse than gimei. Its registration paper is a forgery. That means that the blade is not registered and the blade itself is illegal. I guess that the blade was illegally made in Japan or illegally imported to Japan. The mei on its omote-side is 伯州住延秀 – Hakushu ju Nobuhide. I can read the erased signature under the date on its ura-side. The old signature is also 伯州住延秀 (Hakushu ju Nobuhide). Again I guess that the faker originally intended to make an illegal blade with the mei of 伯州住延秀 (Hakushu ju Nobuhide), but he made a mistake and chiseled the mei on its ura-side at first, and then redone the nakago.

I agree with @uwe. Ref. 日本刀販売専門店　銀座長州屋　鍔　鐔　販売品　阿弥陀鑢桜透鍔（鐔）　銘　戸田彦左衛門, 鍔, 尾張鐔工

昭和二十年正月日 – Showa 20th year (1945), January 服部鍛刀所　頼吉謹作 – Hattori forge Yoriyoshi respectfully made.

The mei reads 備州長舩盛家 - Bishu Osafune Mori'ie.

光弘作 - Mitsuhiro saku

越後守藤原國儔 – Echigo no kami Fujiwara Kunitomo 但シ一部折返銘 – However, it is partially an orikaeshi-mei. 生國　日向飫肥 – Home country, Hyuga Obi 山城國堀川住 – Living in Horikawa of Yamashiro province 信濃守國廣門人 – Pupil of Shinano no kami Kunihiro 時代 - Era 元和頃 – Around Gen’na (1615-1624) 刃長　貮尺参寸余有之 – Blade length is a little longer than 2-shaku 3-sun. 平成五年極月吉祥日　謹研磨之 – Polished this on an auspicious day of December 1993. 研師　眞津仁彰 – Polisher Manatsu Hitoaki

That may be 吉日 - Auspicious day.

秋山飛瀑 – Autumn mountains and waterfall This term is not a proper noun for a specific waterfall, but a general name of a painting motif. 庚午秋畫 – Painted in the autumn of the year of Kanoe-Uma (1990, 1930, 1870, 1810, or older?) 於静修齋林肇基 This might express the place and name of the painter. I am not sure.

Maybe 房宗 - Fusamune.

If it is not 忠 (Tada), it could be 徳 (Toku).

昭和二十年二 – Showa 20th year (1945), 2 The last “2” must be folloed by month and day which are not taken in the picture.

丸形鉄地地透 – Round shape, iron base, open work 無銘尾張 – Mumei, Owari 昭和丁未年夏 – Showa Hinoto-Hitsuji year (1967), summer 寒山 - Kanzan

The upper part of the omote side is not taken in the pictures. I guessed the untaken characters in blue font. 能登守 – Noto no kami 帝室技藝員菅原包則八十四歳作 – Made by an Imperial Household Artist Sugawara Kanenori, 84 years old. 飯野吉三郎君 – Mr. Iino Kichisaburo 君万歳 – Long live you. 大正二年十二月吉日 – Taisho 2nd year (1913), a day in 12th month FYI: 飯野吉三郎 - Wikipedia

The second kanji is a mystery. I guess that the mei could be 兼裳 (a variation of 常) – Kanetsune.

Ref. Swordsmith Index | Nihonto Club

The mei is 関住兼貞作 (Seki ju Kanesada made.). This Kanesada is also a good smith. However, the smith is not 之定 (Nosada) or even popular 兼定 (Kanesada).

Both 来助 and 求助 are old-fashioned names, but I think that both could be possible.