There are basically 3 possible meanings, two that are common, one that is rarely used. The common ones relate to the element Pb, or that you (or another) want to head someone/a group somewhere. The rarely used meaning relates to the last, with lead meaning a cord used with animals to guide them - but even that definition is a derivative use of the 2nd.
Xi, on the other hand, has about 15 different meanings on its own. English has a few words with double - and very few with triple, totally independent - meanings. Chinese written in pinyin has thousands with 4+ meanings, and hundreds with 6+ meanings. Writing without Chinese symbols is basically impossible. I say this as someone who's been learning Mandarin (and a touch of Shanghainese) for the last 7 years, and with a Chinese wife assisting.