Yes, there is a Japanese word for “sun rays in-between autumn leaves”. It is komorebi (木漏れ日). It is a compound word made up of the kanji ki (木), meaning “tree”, more (漏), meaning “to leak”, and hi (日), meaning “sun”. Literally translated, komorebi means “sunlight leaking through trees”. However, it is more commonly used to refer to the dappled sunlight that shines through the leaves of trees in autumn, when the leaves are turning red, orange, and yellow.