What is the ruling on naming a newborn "Maghfira" (forgiveness), and does that fall under the category of self-praise? And if it is forbidden and the name cannot be changed, what should be done?

It is permissible to name a girl "Maghfirah" (forgiveness), because its meaning is concealment, covering, pardoning the wrongdoer, and covering the need of the needy, especially if the intention is to hope that the girl will be characterized by these meanings.

It is better to ask scholars about a name before naming a newborn, to avoid embarrassment.