Atlus has confirmed, via Twitter, that the name of the Phantom Thief group composed of the main characters in Persona 5 can be named.

Translation via @domipersona:

Morgana – "I'll make you shut up right now!" nyaヾ(*ΦωΦ)ツ

It has been confirmed that we can name our phantom squad!! https://t.co/PLFuvVRaSU — dominationkid w. (@dominationkid_w) September 11, 2016

When using the online “Thieves Alliance” system to help other players and receive help in battle, the unique name of one’s thief group is what will be visible to others.

Persona 5 is slated to be released for the PS3 and PS4 in Japan on September 15, 2016. It will release in North America and Europe on February 14, 2017, and in traditional Chinese and Korean in 2017.

— Twitter