[SB]well as you already know L is pronunced the same way as "R" well TH is some times confused with "S" (Aeris Aerith) so I think Faris is a joke on that common mistake so Tha-Riss-aH (AKA Far-iss-a) is Actualy SARISA
You're close...... In Japanese th and s are the same sound, so they're not mistaken, they're just the same. Also, Sarisa's speech impediment was just that. You can't mistake an f for a th in Japanese. The f is actually a combination of the sounds that in English are identified as f and h. I love linguistics, it's fun