I speak only a little bit of the Tsalagi language but I'll try to explain something about pronunciation and spelling.

The spelling of names and words when they are written in English is phonetic because the only written language of Tsalagi is the glyphs invented by Sequoyah, which doesn't run parallel to English letters. The alphabet we use to speak and write English can only convey the Tsalagi language in spellings that are as close as possible to the way the word actually sounds, instead of attempting to convert it from the spelling it may have in Sequoyah's alphabet. There are letters that stand for certain sounds only found in that language. One of these is the "Tlv" at the beginning of Tlvdatsi. Hope this makes sense. I'm obviously not a linguist! LOL

And so - surprise! Tlvdatsi is pronounced: "Tlv-da-tsi"!

The "tlv" sound looks like a difficult mess of consonant to try to say at first, but it can be pronounced by curling up your tongue a little bit so that it only slightly touches the roof of your mouth and saying the "t" sound with a breathy emphasis. Its almost but not quite a hissing sound that comes out more like L.

Here's a link to a page that might clarify what I'm trying to say. Alphabet and Pronunciation