Fire Emblem characters sometimes have rather unusual names and L'Arachel is probably a perfect example of how the pronunciation could be unclear. The original Japanese katakana of her name from the Japanese version of the game seems to translate to something more like "Rachel". I think the elegant "L'Arachel" is more interesting, though. Because of the original phonetic sounds of her name when written in Japanese, it could be argued that La-Rachel is the correct way to say the name. Based on French phonetics, the L followed by an apostrophe is "la," but shortened because "Arachel" starts with a vowel. So, it could be pronounced: L-ara-chell/L-ara-shell. Unfortunately, because the GameBoy era games did not have voice acting, there is not necessarily an objectively "correct" way to pronounce her name as intended by the creators. If you have trouble saying her name, do not feel bad. It is a common issue with older Fire Emblem titles.