多様
たよう · tayou · JLPT N1 · na-adj
diversity
多 (many) + 様 (kind, sort) = many kinds, i.e. diversity
多 means many and 様 means kind or sort. Together they describe many different kinds, which is the meaning of diversity or variety. 多様 is often used as a な-adjective, as in 多様な人々.
多 — two 夕 (evening) stacked
多 originally depicted two pieces of meat (夕, a variant of 肉) stacked together, suggesting abundance. Over time it was reanalyzed as two 'evenings' piled up — many evenings meaning many days, hence 'many, much'. The doubling itself conveys quantity.