What is the Welsh for forever yours?

There isn't a single, direct translation for "forever yours" in Welsh. However, here are some options that capture the meaning:

Formal:

* Dy fod yn dy hun am byth - This translates to "Be yours forever"

* Yn dy feddiant am byth - This means "In your possession forever"

Informal:

* Fy un i am byth - This literally means "Mine forever"

* Dy gariad am byth - This means "Your love forever"

Poetic:

* Yn dy galon am byth - This means "In your heart forever"

* Yn dy feddwl am byth - This means "In your mind forever"

The best choice depends on the context and tone you're aiming for.