Formal:
* J'aime Logan. (This is the most literal translation and is suitable for formal situations.)
Informal:
* Je t'aime, Logan. (This is more affectionate and suitable for close friends or romantic relationships.)
* J'adore Logan. (This expresses a stronger level of love or adoration.)
* Je suis amoureuse de Logan. (This translates to "I am in love with Logan" and is more appropriate for romantic relationships.)
It's important to consider the relationship you have with Logan when choosing the best translation.