What was Valentine's Day first called?

Answer 1

Answer 1 (Religious Viewpoint)

Valentine's Day has always been called Valentine's Day, or St. Valentine's Day.

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Answer 2 (Historical Fact)

Before Christianity began hijacking Pagan festivals, renaming them and falsely claiming them as Christian celebrations, Valenties Day was actually called Lupercalia. It was a Pagan festival that celebrated love and fertility. it is not known exactly when the celebrations began, but we do know that they began somewhere in the BC timeline, way before Christianity even existed.

Around 496 AD, due to the Roman Empire losing the battle against Paganism, they instead began hijacking and renaming Pagan festivals in an attempt to convert Pagans to Christianity, hence Lupercalia was renamed "Valentines Day".

The most famous festival hijacked by the Roman Christians was Winter's Solstice, which they renamed Christ's Mass (Christmas).

So, to answer your question, the original name for Valentines day is Lupercalia, celebrated by the Pagans, before being hijacked by Christianity in an attempt to force the Pagans and non-Christians to convert.