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Target creature and all other creatures with the same name as that creature get +2/+2 until end of turn.
A face-down creature has no name, so it can’t share a name with anything. This includes other creatures with no name.
Echoing Courage has only one target. Other creatures with that name are not targeted. For example, a creature with protection from green will still get +2/+2 if it has the same name as the target creature.
If the target creature is an illegal target by the time Echoing Courage tries to resolve, the spell doesn’t resolve. No creatures get +2/+2.
The name of a creature token is the same as the creature types it was created with, unless the token is a copy of another creature or the effect that created the token specifically gave it a different name. For example, a 1/1 Cat Soldier creature token is named “Cat Soldier.”
