Decebalus, help needed

We have tried more joking some time ago to find out what could have
meant "Decebalus". It seems there has been indeed just a joke and the
real facts have never been mentioned.

First, the name Decebalus was not a name but a compositum. This name
appeared late, after his victorius war in 84-85 AC.

We know his real name was a variant of Diupaneus, Dorpaneus, Diurpaneus
at least these variations of his name have been recorded by ancient
writers.
So, the name "Decebalos" was given by Dacians to him after his
victorious war against Domitian.

I want to point out that Dio Cassius said he call the Dacians "Daki" so
as they call themselves.
It seems the name "daki" is a plural form as many other folks.

Now, I guess here is the interesting aspect. We know some languages know
the change of "a" to "e" in genitival forms. For instance Rom. "fatã"=
"girl" but "of the girl" is "fetei" with the change of "a" to "e".
Now, we have 2 important aspects.
-the name of the king which was a nickname given after the war
-the name of the Dacians

It appears that there the translation of his name should have been "XXXX
of the dacians"; the construction should be the typically IE
constructions.
Where is the help I am speaking about here?
The first part "deke-" should be seen genitival form of "daki" (
Genitive plural?). The second part is the one who should be explained.

Assuming there have not been too many changes from IE to the times of
Decebalus, then we have to explain the last part which can be maybe
*balus, *ebalus, *abalus. I consider just these forms with /e/ and /a/
before "balus" because I guess such kind of vowels will merge together
in a compositum as the one I am speaking about:
deke+balos or deke+abalos or deke+ebalos will merge easy in "dekebalos".
other forms as *ubalos, *ibalos, *obalos seems to be a bit hard to merge
with "e" together.

Any idea about any similar names with "*Vbalos" where one know the
meaning of this "balos"?

Alex