As per Kalki Purana, Kalki Avatara will have two wives namely: Padmavati and Rama.
From the Purana's 32nd Chapter:
LORD KALKI ENJOYS PASTIMES WITH HIS CONSORTS 343
PadmavatI took off her ornaments and rolled on the ground, so that her
body was soon covered with dust, although her throat appeared bluish
because of the musk. Indeed, it appeared as if she had assumed the
form of Lord Siva to vanquish Cupid.
Understanding the feelings of His poor, beloved wives, knowing that
they wanted to perform conjugal pastimes with Him, Lord Kalki, the
friend of the distressed, approached them so that He could fulfill
As female elephants meet the king of elephants, the Lord’s consorts
jubilantly greeted Him within that forest and thus fulfilled their
cherished desire. Thereafter, Lord Kalki, along with His consorts,
mounted an effulgent celestial chariot that coursed through the sky.
In this way, they enjoyed amorous pastimes in the Vaibhraja forest,
Kuvera forest, and a cave at Mount Mandara.
Lord Kalki enjoyed the nectar of Padmavatl’s lotus-like face, and took
pleasure in tightly embracing Rama. Thus, He became smeared with the
kunkuma from their breasts as they affectionately bit His body. The
Lord became so overwhelmed by love for His consorts that He appeared
to have lost all control over His body.
These two equally beautiful and gentle women embraced Lord Hari, the
supreme enjoyer, to their chest, and thus felt transcendental bliss.
The hairs of their bodies stood on end due to transcendental ecstasy
and this sight made everyone laugh with glee.
After enjoying pastimes of love in many forests, the Lord’s consorts
became exhausted and so they went to a nearby lake with their beloved
Lord Kalki. As female elephants throw water on the king of elephants,
so the uniquely charming consorts of the Lord entered the water of the
lake and began to splash water their husband’s transcendental body.
So from the above passages, it becomes clear that Padmavati and Rama both are (or will be) consorts of Lord Kalki.