The word "大卫" is formed through a process of phonetic translation, specifically to transliterate the foreign name "David" into Chinese. It is created by selecting two pre-existing Chinese characters, "大" (dà) and "卫" (wèi), whose combined pronunciations approximate the sounds of the two syllables in the English name ("Da-vid"). The individual meanings of the characters ("big" and "guard" respectively) are functionally irrelevant in this construction; their sole purpose is to replicate the sound of the source name, resulting in a stable, fixed form used exclusively to refer to that specific foreign entity.