[name_m]Maximus[/name_m] is wonderful for your third child!
You may also consider:
[name_m]Balthazar[/name_m]
[name_m]Marcus[/name_m]
[name_m]Augustus[/name_m]
[name_m]Valentine[/name_m]
[name_m]Walter[/name_m]
[name_m]Laertes[/name_m]
[name_m]Marcel[/name_m]
[name_m]Nestor[/name_m]
[name_m]Duncan[/name_m]
[name_m]Flavius[/name_m]
[name_m]Samson[/name_m]
[name_m]Jupiter[/name_m]