Sora on a boy? I’ve only seen it on girls.
I looked through SSA data for Japanese names. However, I can’t tell if some names are Japanese or not. Some Hawaiian, Finnish, Nigerian, other African, Hebrew, Russian… etc. names can look Japanese if you don’t know. So, which of these are really Japanese and which aren’t? Many I know are, many I can’t remember seeing on anyone Japanese or in any Japanese source (which doesn’t necessarily mean they’re not). I know it’s entirely possible that names that look the same exist in more than one language. Just to show how hard it can be, I left in a few of the definitely non-Japanese ones.
Boys:
Kaito, Kenzo
(Makari - Russian/Greek)
Takumi, Riku
Yuki - I see Yuki (“snow”) more often on girls, though I have seen it sometimes as a boy’s name. In the US, it seems to be equally common on both.
Haki
Hiro - one of the most familiar Japanese names.
Sekou, Takeo, Aki, Akio
Takai - This is one of those cases where I can’t be sure if it’s Japanese or Hawaiian/other Pacific island origin.
Keiji, Ryo, Taiyo, Hiroto, Jiro, Koji, Neiko, Taiki, Kato, Keoki, Makoto, Rei, Sakai
(Tabari - Arabic?)
Akari, Sekai, Keita
Maika - I’ll guess this one isn’t
Takeru, Haruki, Hiroki, Kiyoshi, Ryota, Shinji, Yoshi, Hikaru, Hiroshi, Kaori, Keitaro
Kairi (more common on girls)
Kentaro
Komari, Kumari - These two are suspect.
Nagi, Takeshi
(Kojo - Ghanaian)
Kotaro, Sasuke, Seiji, Taishi, Tomoki, Kaiyu, Kamuri, Keigo, Kosuke, Naoki, Naoto, Shotaro, Sotero, Sourya, Hiroyuki
Ichigo - I’ve seen this as the word for “strawberry”. Sounds slightly odd to an English speaker, particularly as a boy’s name.
Ichiro
(Iniko - Nigerian)
Kenjiro
Kenyi - Good chance this isn’t.
Ryusei, Ryuu, Satori, Takari, Taki, Takuto, Tomoya, Yuji
Girls:
After Akira, Sakura, Sayuri and Yuri, Aiko is the commonest in the US.
Sarayu, Akemi, Sakina - Particularly the second looks Japanese, but I expect none are because I can’t recall seeing what would be some of the commonest Japanese names if they were.
Midori - “green”
Kimi, Kimiko, Saori
Suki - though some may be from its use as a nickname for Susannah, this is definitely a Japanese name
Yuki, Tamika, Sakari, Yui
Momoka - I’ll assume it’s related to Momoko “peach girl”, another of their fruit names.
Takara, Akiya, Haruka
Marika - Yes, this could be a form of Mary. I still suspect it’s Japanese, because I’ve seen Mari and Mariko.
Takia, Aimi, Keiko, Yukari, Akane, Ayame, Asuka
(Maika on this side too - what language is it?)
Shiori, Hikari, Keiri, Minami, Misaki
(I guess Miyani isn’t.)
Sachiko, Saki
(Takoda’s probably Native American.)
Aika
Akaya - or is it Hebrew?
Aoi - “blue”
Harumi, Hiromi, Kyomi, Mariko, Mayumi
Mieke - I’ve seen this claimed as Dutch several times, but also at least once as Japanese. It’s possible it’s like Naomi, a coincidentally duplicated name. The pronunciation wouldn’t be the same in Dutch and Japanese.
Miku, Miyoko, Mizuki, Oyuki, Rei, Reika, Rin, Saima, Shiza, Yumiko, Ayo
Kimori, Kumari - again suspect
(Mairi - Scottish, Miiaka - guess Finnish?)
Namiya
(Shiri - Hebrew)
Yasuri, Yuzuki, Chika, Hanaki, Hidaya, Izumi, Kayori
Kenji - which I only knew of as a male name
Kiyoko, Maka, Michiko, Miyako, Momo, Natori, Rikiya, Riko, Sahori, Sakira, Ayano, Chiyo, Kumiko, Maki, Manami, Miko, Miniya, Miriya, Miu, Miyari, Nanako, Natsumi, Nishika, Nozomi, Sairi, Saiyuri, Sakara, Seiko, Yori
Yujin - I’m sure I’ve seen this name/word in Chinese, Japanese and Korean, so I’m not sure in which case it’s a female given name.
Yori, Aki, Ayako, Haruna
(Kaimi - Finnish. The most deceptively Japanese-looking of Finnish names, to the point I expect it might exist independently in Japanese.)
Kaomi, Koharu, Mako, Reiko, Rui, Rumi, Sumayo, Sumire, Sumiya, Yuriko
Yoshi - Another I only know of on boys. In general, names low on the SSA list show a significant number on the opposite gender, and I don’t know if this data is correct.