This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
彣 combines 文 (pattern, writing) with 彡 (hair, brush strokes), suggesting an embellished or patterned appearance. The exact historical development is uncertain.
Picture 文 (writing) decorated with extra brush strokes 彡, like an ornate calligraphic pattern. The kanji suggests something patterned or embellished, but its exact meaning is unclear.
For ブン, imagine a bun decorated with intricate icing patterns: bun -> ブン, and the icing strokes look like the 彡 added to 文.