[minminRW]

- I'm not sure about the exact pronunciation in japanese as this is a chinese name too and it seems more usual in chinese. I pronunce it may-eh in japanese. I would like someone to confirm it. Some person told me it is more like "may", but it sounds more like a anglisization to me, but still I can be wrong too
In Japanese, there is no differnce between Mei and May.

- I found that Mei may means "light/clear" and can be write with the sun and moon kanjis... but it was not on a serious japanese site so I would need a confirmation of that.

Perhaps you mean 明. I think it is not good choice.
Commonly this kanji is used for Male and pronounced Akira.
There may be many Japanese girl called Mei-chan, their names are written as below.

明依，明唯，芽衣，芽依，芽惟，芽唯，芽意，愛衣
明=bright，唯=only，芽=sprout，衣=cloths，依=reliance，惟=think� ��愛=love

- I like the kanjis for sprout and life too...but would need confirmation too.
芽生
Possible, but difficult to read.

- If you know other females japanese names who would fit in your idea in a French/English world, that would be nice to hear it!
For example
Anna　杏奈、安菜
Mari　真理、麻里、茉莉