I changed the display name of this artist.
The most common romanization of 新田一郎 is Ichiro Nitta by far, written on all his solo albums with Horn Spectrum:
1st solo album: Cool Ga Atsui
https://auctions.c.yimg.jp/images.au...9kgz127343.jpg
2nd album: After Image
https://img.discogs.com/VSp0lVwUwmf6...-6111.jpeg.jpg
3rd album: Kotobuki
http://img15.shop-pro.jp/PA01239/479...20160714143931
4th album: Fukusuke
http://img15.shop-pro.jp/PA01239/479...20150331180308
5th album: Simulation
https://vgmdb.net/db/covers.php?do=view&cover=250012
6th album: Saga
http://img15.shop-pro.jp/PA01239/479...20160714143304
We found this romanization too on these albums:
Comics Original Album Area 88 (CD Version):
https://vgmdb.net/db/covers.php?do=view&cover=300178
Purple Eyes In The Dark Original Album:
https://vgmdb.net/db/covers.php?do=view&cover=266963
Bari Bari Legend PART II Suzuka-hen Original Soundtrack Ongakuhen:
https://vgmdb.net/db/covers.php?do=view&cover=191688
I only saw Ichirou Nitta (which is therefore a variation) on this album:
Original Animation Video Area 88 ACT:III Moeru Shinkirou Music Collection:
https://vgmdb.net/db/covers.php?do=view&cover=228230