Is it permissible to name a boy Haydar and a girl Saba?

There is no objection to naming a newborn "Haydar," as it is free from naming prohibitions. Ali ibn Abi Talib himself was called by this name. It means "lion" or "the lion due to the thickness of its neck and the strength of its forearms."

Similarly, there is no objection to naming a daughter "Saba," which means "the wind that blows from the east." The Prophet, peace and blessings be upon him, was aided by it.