So, in theory, is it possible that Satoshi Nakamoto got the alias from Ash Ketchum in original japanese name of the protagonist and watched the series and derived that first name and just added the surname Nakamoto from somewhere else as reference too?
Possibly, or also any of these people with the name Satoshi:
Satoshi Arai (荒井 聰, born 1946), Japanese politician
Satoshi Furukawa (古川 聡, born 1964), Japanese surgeon and astronaut
Satoshi Hamada (浜田 聡, born 1977), Japanese politician
Satoshi Hashimoto (橋本 さとし, born 1966), Japanese actor and voice actor
Satoshi Hatakeyama (畠山 智之, born 1958), Japanese journalist
Satoshi Hino (日野 聡, born 1978), Japanese voice actor
Satoshi Ishii (石井 慧, born 1986), Japanese judoka and mixed martial artist
Satoshi Inoue (musician) (井上 智, born 1959), Japanese jazz guitarist
Satoshi Inoue (politician) (井上 哲士, born 1958), Japanese politician
Satoshi Kamiya (神谷 哲史, born 1981), Japanese origami master
Satoshi Kanazawa (born 1962), American-British evolutionary psychologist
Satoshi Kawata (河田 聡, born 1951), Japanese scientist
Satoshi Kinsui (金水 敏, born 1956), Japanese linguist
Satoshi Kitamura (きたむら さとし, born 1956), Illustrator
Satoshi Kojima (小島 聡, born 1970), Japanese professional wrestler
Satoshi Komatsu (小松 聖, born 1981), Japanese baseball player
Satoshi Kon (今 敏, 19632010), film director, animator, screenwriter and manga artist
Satoshi Maruya (丸谷 里志, born 1947), Japanese swimmer
Satoshi Matsuda (松田 悟志, born 1978), Japanese actor
Satoshi Matsuoka (松岡 聡), Japanese computer scientist
Satoshi Mikami (三上 哲, born 1968), Japanese actor and voice actor
Satoshi Mitazono (三反園 訓, born 1958), Japanese journalist and the governor of Kagoshima Prefecture
Satoshi Miyagi (宮城 聰, born 1959), Japanese theatre director
Satoshi Mizukami (水上 悟志, born 1980), Japanese manga artist
Satoshi Mori (basketball) (森 哲, born 1949), Japanese basketball player
Satoshi Mori (skier) (born 1971), Japanese Nordic combined skier
Satoshi Morimoto (森本 敏, born 1941), Japanese scholar
Satoshi Motoyama (本山 哲, born 1971), Japanese race car driver
Satoshi Nakamura (中村 哲, born 1958), Japanese computer scientist
Satoshi Ohno (大野 智, born 1980), Japanese actor and musician
Satoshi Ōmura (大村 智, born 1935), biochemist, a winner of the 2015 Nobel Prize in Physiology or Medicine
Satoshi Sato (佐藤 聡, born 1979), Japanese footballer
Satoshi Sato (skier) (佐藤 智, born 1962), Japanese cross-country skier
Satoshi Shiki (士貴 智志, born 1970), Japanese manga artist
Satoshi Shimizu (清水 聡, born 1986), Japanese boxer
Satoshi Shingaki (新垣 諭, born 1964), Japanese professional boxer
Satoshi Sumida (隅田 敏司, born 1962), Japanese swimmer
Satoshi Sumita (澄田 智, 19162008), Japanese businessman, banker, and the 25th Governor of the Bank of Japan
Satoshi Suzuki (鈴木 智), Japanese screenwriter
Satoshi Tajiri (田尻 智, born 1965), creator of Pokémon
Satoshi Takayanagi (高柳 慧, born 1938), Japanese long jumper
Satoshi Takano (高野 智史, born 1993), Japanese shogi player
Satoshi Takeda (武田 聡, born 1968), Japanese swimmer
Satoshi Tanaka (田中 聡, born 2002), Japanese footballer
Satoshi Tomiie (富家 哲, born 1966), Japanese DJ and electronic music producer
Satoshi Tomiura (冨浦 智嗣, born 1991), Japanese actor
Satoshi Tsumabuki (妻夫木 聡, born 1980), Japanese actor and singer
Satoshi Tsunami (都並 敏史, born 1961), Japanese football player
Satoshi Uematsu (植松 聖, born c. 1990), perpetrator of the Sagamihara stabbings
Satoshi Urushihara (漆原 智志, born 1966), manga artist and artist
Satosi Watanabe (渡辺 慧, 19101993), Japanese theoretical physicist
Satoshi Watanabe (beach volleyball) (渡辺 聡, born 1975), Japanese beach volleyball player
Satoshi Yagisawa (八木澤 教司, born 1975), Japanese composer
Satoshi Yamamoto (山本 サトシ, born 1965), illustrator of Pokémon Adventures starting in volume 10
Satoshi Yanagisawa (柳澤 哲, born 1971), Japanese race walker
Satoshi Yoshida (吉田 智志, born 1990), Japanese footballer
Satoshi Yuki (結城 聡, born 1972), Japanese professional Go player
or any of these fictional characters:
Satoshi Himuro (氷室 聡), in the Red River universe
Satoshi Hiwatari (日渡 怜) or Satoshi Hikari (氷狩 怜), in D.N.Angel media
Satoshi (Urusei Yatsura) (サトシ), also known as Megane, a member of Lum's Stormtroopers
Satoshi Hojo (北条 悟史), in Higurashi no Naku Koro ni media
Satoshi Omiya (大宮 智史), a racer in Initial D series
Satoshi Fukube (福部 里志), in Hyōka
Satoshi Mochida (持田 哲志), in the Corpse Party series
Satoshi Isshiki (一色 慧), in the Food Wars: Shokugeki no Soma
Satoshi Tsuchida (土田 聡史), in the Kuroko's Basketball
