No. I don't think nature names sound unprofessional or uneducated, unless they are really misspelled.
Actually, I give parents credit when I see nature names. I try not to put too much personality predictions into names, other than what was going on in the mind of the parents. But if I had to I'd say that children would be raised by parents who care about the environment. They would be raised to be kind and respectful. I'd never bet the house on it. This is just a pure generality.
Willow -- I used to think "weeping willow" but I'm over that now. It has an ethereal charm
Meadow -- Lovely, lovely, lovely. And that zippy "o" sound at the end is so intriguing.
Robin -- Sweet, sweet, sweet
Raven -- Too goulish for me
Skye -- My parents honeymooned on the Isle of
Skye so it has a very romantic feeling for me
Primrose -- the "prim" part ruins it for me :-(
Autumn -- too sad sounding as a name -- that's weird, because I look forward to the season and I love
Winter as a name -- go figure