Madoc is mostly correct. Traditional Dovah names do not have prepositions or conjunctions in them. The word do wouldn't be used in a Dovah name. Perhaps you could use the word V3N ("Shine") as a possible third word in the name Thu'um.

Look through the Dictionary and see if there are any other words that you think would fit your name. Otherwise, find some combination of the following three words and put them together to create a Dovah name for Lucas!

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Some possibilities are MUNkunviin, KUNviinmun, and V3Nkunmun.

Hi! I think I have your answer here:

In order to make aname in Dovazuul, you need to find a nice way to split it down, All names can be expressed as Thu'ums in Davah, so you need a three part name.

Looking at the origin of the name, Lucas seems to mean "Man from Lucenia", and Lucenia comes from the words "Bright City" in Latin, so we'll make the name in English "Man of Light".

Plugging that in the translator gives you the thu'um version of your name, which is "Mun Do Kun". Lump them together, and you have the name: Mundokun.

You can convert it to runes using the Transcriber function in the dictionary, and there's more info there, but I hope this helped!