Internationally, they'll be called as
Satoshi Ono (Satoshi is the first name)
Sho Sakurai (Sho is the first name)
Masaki Aiba (Masaki is the first name)
Kazunari Ninomiya (Kazunari is the first name)
Jun Matsumoto (Jun is the first name)
But inside Japan, Surnames comes first and then the first name. So it will go like...
Plus, in Japan, people don't call each other through their first names UNLESS, you are close to call each other through names.
Therefore in Japan, most people will call them through their surnames+prefix (e.g Ono-san/Ono-kun)