The Chinese word "卡西欧" is formed by phonetically transliterating the English brand name "Casio" into Chinese characters, with each character representing a syllable: "卡" (kǎ) approximates "Ca", "西" (xī) approximates "si", and "欧" (ōu) approximates "o", resulting in a sequence that mimics the original pronunciation without regard to the literal meanings of the characters.