I like a lot of word names, but
Treasure is one of the over-emotional ones, in my opinion. Like
Miracle or
Precious, it'll be fitting from the besotted new parents' point of view, but not from anybody else's.
A future employer or colleague would feel ridiculous addressing her as
Treasure imo. Of course your daughter will be your treasure, but the name just won't work in everyday scenarios, and she'll still be your treasure if you give her a more usable name.
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"There are few more distressing sights than that
Of an Englishman in a baseball cap
Yeah we'll die in the class we were born
That's a class of our own my love"
♥
Elinor♥