Almighty, eternal God, You gave Saint Daniel and his companions the grace to suffer for Christ. Support our weakness with divine strength so that we may not waver in professing our faith in You, even as they did not hesitate to die for You.

Any time I hear the word “and companions” I wonder about the identities of these people who walked with their leader. Knowing the names of the unmentioned saints is not mere curiosity. I figure that these men laid their lives on the line for Christ and the Church under great great persecution they ought to be known. Obviously they are important because the Church infallibly declared these men saints. And it would be too clumsy to name each person in the group in the Mass/Divine Office we simply say “and companions.”
The martyrology lists the companions as being Samuel, Angelus, Domnus, Leo, Nicholas, Hugolinus, and Elias.

More on the martyrdom of Saint Daniel and his companions may be foundĀ here.