See also the related form, the Arabic and Urdu Nahida.
Nihad is not commonly used as a baby girl name. It is not in the top 1000 names.
Baby names that sound like Nihad include Nada (Arabic, Polish, Slavic, German, Italian, and Russian), Nadda (Arabic), Nadette (French), Nadie, Nadja (German, Italian, and Russian), Nady (English), Nahyde, Naida (Slavic, English, and Russian), Namid, Namide, Namyd, Namyde, Nanda, Nanette (French and English), Nata (Polish, Slavic, and Russian), Natanne, Nati (English and Spanish), Natie (English), Natti (English), and Nattie (English).
† approx English pronunciation for Nihad: N as in "knee (N.IY)" ; IH as in "it (IH.T)" ; HH as in "he (HH.IY)" ; AE as in "at (AE.T)" ; D as in "day (D.EY)"