The name "Octavian"

[Tib. Gabinius]

According to Professor Vössing of University Bonn:
He was born under the name C. Octavius, and everyone will used this name in his childhood..
After 44 his official name was C. Julius C. Caesar, but he already changed it to pronounce the filiation: C. Caesar C. f.
In the year 40 the first steps to change the titles to names and other way started, cause now he called himself Imp. Caesar and in the same near, according to the divinatio of his "father" Imp. Caesar divi f.
In Jan. 27 bc he was able to call himself same way, but with the "Augustus" at the end.
In 23 bc he called himself with full title, which he occupied right for his name:
Imperator Caesar divi f. Augustus trib. potestate, in 12 bc he added the pontifex maximus and at least, 2 bc he he full name and titles:
Imperator Caesar divi f. Augustus pontifex maximus trib. pot. XYZ (years he had it) imp. cos XYZ pater patria.

As we can see, he included titels to his name as part of the names, worn titles as titles, took a cognomen to a nomen gentile and so on....


Edit: and btw, "primus inter pares" ...