Correct spelling for the English word "Regnancy" is [ɹɪɡnˈansi], [ɹɪɡnˈansi], [ɹ_ɪ_ɡ_n_ˈa_n_s_i] (IPA phonetic alphabet).
The condition or quality of being regnant.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.