What Idol Groups in Love Live have real life counterparts? According to this question, both μ's and Aquors are real life groups. 

So, I am wondering what other groups that are mentioned in Love Live! School Idol Project and Love Live! Sunshine!! are also based off real life idol groups.
In Japan, they are generally called as seiyuu unit (Japanese Wikipedia) when a music/acting unit (group) consists of voice actors. For a special case where a group also works as a real-life idol, it is called seiyuu idol unit.

According to the Wikipedia, there are 3 units, but only 2 are seiyuu idol units:


A-RISE (created for Love Live!, no live event/talk)


Kira Tsubasa: Sakuragawa Megu
Toudou Erena: Matsunaga Maho
Yuuki Anju: Ohashi Ayuru

μ's (created in 2010 for Love Live!, 6 live events, 4 live talks, 18 guest appearances)


Kousaka Honoka (Leader/Printemps): Nitta Emi
Ayase Eli (Bi Bi): Nanjo Yoshino
Minami Kotori (Printemps): Uchida Aya
Sonoda Umi (lily white): Mimori Suzuko
Hoshizora Rin (lily white/NikoRinPana): Iida Riho
Nishikino Maki (Bi Bi): Pile
Toujou Nozomi (lily white): Kusuda Aina
Koizumi Hanayo (Printemps/NikoRinPana): Kubo Yurika
Yazawa Nico (Bi Bi/NikoRinPana): Tokui Sora

Aquors (created in 2015 for Love Live! Sunshine!!, 2 live events, 5 live talks, 3 guest appearances):


Takami Chika (Leader/CYaRon!/Gu~RinPa): Inami Anju
Sakurauchi Riko (Guilty Kiss): Aida Rikako
Matsuura Kanan (AZALEA): Suwa Nanaka
Kurosawa Dia (AZALEA/Gu~RinPa): Komiya Arisa
Watanabe You (CYaRon!): Saitou Shuka
Tsushima Yoshiko (Guilty Kiss/Gu~RinPa): Kobayashi Aika
Kunikida Hanamaru (AZALEA): Takatsuki Kanako
Ohara Mari (Guilty Kiss): Suzuki Aina
Kurosawa Ruby (CYaRon!): Furihata Ai