The first looks like 'Caesar's Brother' and the other two look like seedlings of the species (Iris siberica), which are variable in height (and other characteristics).

Joe

I have not seen caesar's brother, but i have seen several varieties that could easily be confused with the first one here. Don't be in a hurry to give it a name, just enjoy it for it's beauty. The older siberians are particularly difficult to tell apart if you loose their tags. These could easily all be seedling plants.
It helps if you have some idea where the plants originated. Where they given to you by a friend, or ordered from a grower? Were they in a garden you moved into, or did you maybe buy them at a general nursery, without names? Did they have names and you lost the tags? Answering these questions will help us to know if they were ever named, and if there is any possibility of refinding that name.