Miqo'te Seekers of the Sun expanded naming conventions (unofficial) and tribe list

[Voidmage]

Just a quick note for maybe those who are interested in it.
And thanks for all the info.
It is a much needed compendium.

Miqo\'te = ミコッテ (Mikotte, Mikot\'te)

I think Mikotte is the correct spelling here (you used it later) because of the small ッ.
As a soukon (it is small and therefore not pronounced as Tsu) it doubles the following symbol.
So it would be spelled Mi (mee) Ko (a pause here) Tte (you double the following consonant).

I just leave it here in case anyone finds that spelling interesting.

And a quick tip:
The = before the katakana looks really close to "Ni" and actually confused me at first.

Edit:

For the Katakana:

I guess the English letters came first and were translated into similiar sounding vowels.
Important here is that the vowels are pronounced soft most of the time so シ wouldn't really be like the English "she" but sound more like shi with a soft sh (sorry I can't say it better. It's far easier with German as your first language). Think of Shinra in this case.

The reading of チ is chi instead of ti mostly. They probably used チャ because they wanted to pronounce it as cha instead of ta which would have been タ as you found out.
The ャ is small here so you don't pronounce it in itself.
But granted I am not so fit in the fine tuning of the languaqe so I don't know the why behind it but if I had to guess it's probably just preference.

ジョ should probably be read as jo (like in John) because the ョ appears to be small.
Zyo from which I know is an old form and not really used nowadays (same as tya).

It's hard to tell how they want to have some of those read because some combinations have multiple ways to be read and as far as I know there are even differences between which system you use.
I am still learning Japanese so if I find out more I can post it here.

So in short it's important to look if the second Kana is big or small because in the later case it becomes a soukon and isn't read in itself.
I hope that clears a few things up but I would be glad if someone with more knowledge in Japanese than me could give their input here.