Duude. I thought we were Anatolian/Levantine/Nomadic, not Welsh. I look at these names and had the same feeling when I did my first CK2 playthrough - how am I supposed to enunciate this?
Other than that, major props.
So, I know it is an extreme necro of a post some ~1500 (Jesus Christ, boys) pages back but I wanted to address it.
Languages are fun, and conlanging is oftentimes moreso. From the hints that AN has dropped us we know that Yamarish(or whatever) is a mishmash of languages and sounds due to the mishmash nature of the culture itself. Predominantly, Welsh and Aramaic are common overtones. The former is the cultural base the Ymaryn formed from, and the latter was the extremely widespread result of a combination of similar Semitic languages that formed over the entire region (irl).
For reference, Aramaic and it's immediate predecessors gave rise to pretty much all of the languages you see around the Mediterranean. Aramaic in particular, is an immediate predecessor to Arabic and Modern Hebrew. Surprisingly, it isn't really a dead language. Portions of The Torah are written in Aramaic and many orthodox practitioners of Judaism and Islam can read and speak it.
So, what does Ymarish sound like? Well, it's a bit of a paradox. Welsh is spoken on the tip of the tongue and is a lilting, graceful language. (Tolkien used it as the base for Elvish). On the other hand, the Aramaic languages are spoken with the back of the tongue with longer vowels. (Its part of why you see the glottal stop show up so much)
So, some specific sounds that you might want to know:
"LL" is a sound unique to welsh, and its a bit like a "th" in "thanks" but not. It is made by placing the tip of the tongue behind your front teeth and blowing air past it.
"CH" is a glottal sound(I'm not a linguist) that is present in numerous languages, but is stereotypically herbrew. If you see a "ch" in spelling, it is this sound. Don't think of it as a harsh "ch" in "church" or "catch". Those are done with the teeth, listen to Gal Gadot speak to get an idea.
Vowels are probably universally long, deep, and drawn out. As a result of Aramaic influence.
So, here, listen to the beautiful Gal Gadot for some hebrew:
And this guy for some welsh:
If you noticed, Gal sounds a lot like she has a French accent. Try and translate that onto the Welsh the other guy was speaking and you've got the sound probably right.