Three, level 20 orcs have the same titles, so makes them not feel as special, as orcs should feel being they are by far one of a kind in the company of their kin.
So I propose having 4-5 possible titles per rank for however many ranks Immortals are willing to spend time creating different titles for.
Would help each orc add to their 'individual' orc role play, and the nastier orcs would be in window for the cooler titles.
I could also see why not making this based over everyone
Too much work, and it's just some loving for a one of a kind Berserker class that I feel deserve it.