Sayyidat-al-Nisa and Manha are both acceptable. Manha does not mean “gift from Allah”, Minha means that. For Manha’s meaning please type it in the search box.
Aqiqah is considered a sunnah (not an obligation) by many scholars, and this only applies to first names when first naming a baby. Aqiqah is not done when changing a name, according to this fatwa by Sheikh Abdurrahman bin Nasir al-Baraak.