It's not even an official verse but the brainrot is strong so I'm putting headcanons here.
While Wahi doesn't really have to glamour himself, he does give himself an 'official' name while on Eorzean soil to better fit in. While he chose it because it sounds similar to his actual name, the name he chose has a lot of symbolic meaning to him.
Wahtityl A(h)ldaeg or "Guard the valley, eel soldier"
You must be thinking, "Wow. The funny-looking Roegadyn has an even funnier/cryptic sounding name." okay yeah Wahtityl sounds really funny, but think about it for a sec. Think real hard about the meaning of it.
"Guard the valley, eel soldier."
Valleys have a lot of meaning to them. They can mean something positive, like 'life and abundance, peace, civilization' but they can also be a symbol of war, or in mental health, a low point in one's life.
Eels also have a lot of symbolism. They are the 'lesser serpent' and considering during the Empire years he was very much the lesser of the two brothers and unlike snakes, eels can only thrive in the water. They are elusive and living in murky water they blend into their environment well. They also have a very strong emotional connection and are often seen as inspiration. Plus they have really sharp teeth.
In a WoL situation, you could read it as "Guard the peace of eorzea, inspiring soldier"
or if you wanna kick him in the knee, "Guard your emotional lows, lesser warrior."