Here are some options depending on the context:
* Cariad: This is the most common word for "love" in Welsh, and it can also be used to refer to a lover. However, it's more common to use it for a romantic partner or someone you love deeply.
* Annwyl: This word means "beloved" and can be used to refer to a lover, especially in a romantic context.
* Partner: This word is increasingly used in Welsh to refer to a romantic partner, including a lover.
* Cymrawd: This word means "companion" and can be used to refer to a lover, especially in a more platonic or long-term relationship.
* Dyledwr: This word literally means "debtor" and can be used in a playful or humorous way to refer to a lover, implying that they are indebted to you for your affection.
Ultimately, the best word to use depends on the specific context and the relationship between the two people involved.