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Belle

Not Beau as that is masculine

Beau is a boy's name. It's the masculine form of 'beautiful' in French. The female equivalent is Belle.

Belle.

Beau is a masculine name/word.

Beau can't be a feminine spelling as the word is a masculine french word.

beau
bəʊ/
noundated
noun: beau; plural noun: beaux; plural noun: beaus

1.
a boyfriend or male admirer.
synonyms:boyfriend, sweetheart, lover, fiancé, darling, partner, significant other, escort, young man, admirer, suitor, follower; More
informalsteady, date, toy boy, fancy man, fella;
literaryswain
"she was approached by three potential beaux"
2.
a rich, fashionable young man; a dandy.
synonyms:dandy, fop, gallant, cavalier, man about town; More

Bow

There is only one spelling of the name Beau.
But it is a boys name.

Beau is as mentioned above the masculine form of the french word for beautiful although actress Bo Derek did have the "B" "o" spelling for her name. I don't think I could lumber a child with the possibility that other kids were call her B-O

My daughter's middle name is Bo.
I did get asked by grandparents about the spelling but I just said 'Bo as in Bo peep'

Bo Dereks real name is Mary

Bo isn't Bo Dereks real name (it's Mary)

Beau is a boys name. And you spell it Beau.

I know a few Bo's but they are all male and from Sweden
Beau is a boys name but if that doesn't bother you then go for it.

Since Beau, Bow and Bo don't work for you, how about Boe? It's odd but it would give you the sound you want.

Baugh?

Beaux a friend of dd has this name, I love it

Baugh

Sounds like Bach gone wonky

Or the prelude to vomiting

For a girl? Belle.

Beau is a boy's name, and that is the only correct spelling.

Beaux

That is the plural of the masculine adjective Beau.

So it is doubly wrong to call a single (as in only one, not unattached!) girl "Beaux"

But does it really matter if the parents like the name? I opted for traditional names that other people dislike but it would not have affected my decision to choose those names.
Op if you like the name go for it

Beau feels like a boy's spelling because it is a boy's name.

I think you mean Belle.

Well I genuinely didn't realise the spelling Beau was masculine I got it from a baby name app which said it was unisex. See photo attached. Also distantly know of two female Bo's admittedly not spelt Beau though.

Professor Crawford think your response says more about your intelligence/character then mine.

Thanks to those who answered the original question.