Not always. There are those certain houses that do get codenames (Wisconsin, Aka Halloween; Doris Day, Aka FvJ) but there are other houses to where we don't get codenames at all for.
There are two houses that are left to be announced, and both are on the Universal Backlot. The one most likely being announced tomorrow, Krampus; and the other being one that neither coast has a codename for, atleast; that we know of.