Nameera is the feminine version of the boy name Nameer, which means "pure water", "pure", "ample", a person who comes from a noble family. Nameera and Nameer are not Quranic names but since their meaning is good Muslims can use them.
Nameera is pronounced as [(NU)mber] + [(MEE)t] + [(RU)n], with emphasis on the second syllable. It is written as نميرة in Arabic and can also be written as Namira, Namirah, Nameerah, Nemire, Nemira, Nemeerah, Namyra, Namiyra in English.
There is also a boy name Numair, pronounced [(N)ew + p(U)t] + [(MAY) + p(R)ay], which has the same meaning as Nameera and Nameer.