* Kapatid ng kaluluwa (literally "sibling of the soul") - This is a poetic and widely understood phrase that captures the idea of a deep, spiritual connection.
* Tunay na pag-ibig (literally "true love") - This phrase emphasizes the enduring and profound nature of the relationship.
* Kamag-anak ng kaluluwa (literally "relative of the soul") - This is a less common but equally powerful phrase that conveys a strong sense of belonging.
* Ikaw lang ang para sa akin (literally "You are the only one for me") - This phrase is more about romantic love and exclusivity.
Ultimately, the best Filipino word to use for "soul mate" will depend on the specific context and your desired level of formality.