The name
Valentine (masculine) has always been a guilty pleasure of mine. I love the name and meaning, but it's not something I think I could bring myself to use, other than as a middle name.
Valentin I think is more manageable as a first name while preserving the spirit of
Valentine (funny how cognates do that, huh?). But what do you think of the name
Valentin?
Valentin August?
Valentin Ezra?
Valentin Lewis?
Valentin Miles?
Valentin Silas?