To continue in Ejnar’s vein, my absolute favourite: Trango’s
Nameless Tower!
But it is important to differentiate between
unnamed peaks and
peaks named "unnamed" (or similar), such as
Peak sans Nom or
Nameless tower.
More seriously, I think SP is not the place to give a new name for an unnamed mountain, but it may appropriate to post an unnamed mountain together with its altitude, for example “
P5430m”,
Peak 5430m” or “
Unnamed Peak 5430m”. All these options sound good to me. It is also useful if you mention in the name whether the altitude is in metres or in feet, e.g. “
Unnamed Peak 5430m” or “
Unnamed Peak 5430ft”.