you and thou

The informal pronoun ako, you, comes from the Old High Eclectic verb stem adako, to be in the presence. In the first version of this language I had the second person pronouns te and tete (singular and plural). I was thinking that in this version these pronouns are replaced with tu and vos from an old Indo-European language I started to design between version one and Brithenig. My notes say allow for a familiar thou-pronoun, and I suspect that ako is going to push out tu. I may keep it in a reduced form as a suffix -t