[Avodah] Names ending with -ah or -ahu

[Akiva Miller]

.
Consider these examples: Yeshayah / Yeshayahu. Yirmiyah / Yirmiyahu. Eliya
/ Eliyahu. And others. When a person among us has such a name, they usually
have a preference regarding pronunciation and spelling.

But my question is about the Neviim and their seforim. Is there an accepted
convention for when they end with "ah" and when they end with "ahu"? From
what I have heard when other people speak, and from what I've seen in the
printed word, they seem to be totally interchangeable. But I know how my
brain works, and it's quite likely that there is some pattern that I just
never noticed.

(I did try to research this in my Concordance. It seems that Tanach refers
to Yeshayahu exclusively with the final vav; there is a Yeshaya, but that's
a totally different person. And yet, people DO refer to the navi as
Yeshaya, On the other hand, Yirmiyahu and Yirmiyah both refer to the same
person, and although the great majority are spelled with the vav, the cases
where it ends with the heh are NOT marked as ksiv/kri.)

Any suggestions?

Thanks!
Akiva Miller
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