technically, yes. but you would have to conjugate it. a female would be belle, not beau. belle is the feminine form of beau.
A swain is male admirer, a beau, a boyfriend; a female is a female admirer, a girl, a girlfriend, or leman, a word for sweetheart, lover, or mistress; a word as old fashioned as swain.
The opposite gender of a beau is belle. A beau is a male admirer, while a belle is a female admirer.
Related nouns for a female are girlfriend or sweetheart.
Change to masculin : Elles
She came into the dance with a handsome beau. Daniel was an attentive beau. Silvia was a notorious beau snatcher.
A swain is male admirer, a beau, a boyfriend; a female is a female admirer, a girl, a girlfriend, or leman, a word for sweetheart, lover, or mistress, as old fashioned as swain.
One word for a suitor that ends with "u" is "beau."
Beau is pronounced "boe" to rhyme with toe.
Names are a question of taste; what you can get away with varies from place to place. It is difficult to imagine a female being named beau in any French-speaking country. Beau is the masculine form of a word, which would never be used to describe a girl. Beau = handsome (of a male). Belle = beautiful (of a female). Notice that even in English you don't call men beautiful, and saying that a woman is handsome is really "damning with faint praise". So, the short answer is yes !
Beau
The word 'beautiful' has three syllables: Beau-ti-ful.