Name suggestions

Boyfriend middle name is Steven and was thinking of naming our son Steven but I need a middle name for Steven or vice versa a first name for middle name Steven... Also I like the name Giovanni, Anthony or Antonio, michaelangelo, Sebastian, Mateo, Leonardo.. I'm willing to do any of those names but I am having trouble trying to find a middle name for those too. My last name is Ortiz by the way! Suggestions will be greatly appreciated!