The plural of may is the same word (still may)
Who may be singular or plural.
The plural of trapezium may be trapeziums or trapezia.
The plural of the surname may be Simmons or Simmonses.
The Latin plural is pupae. The English plural may be pupas.
The plural of thorax may be either thoraxes or thoraces.
The plural of flamingo may be either flamingos or flamingoes.
Species may be singular or plural.
For the animal (topi), the plural may be topior topis (like antelope).For the type of pith helmet (topi), the plural may be topis or topees.
The plural of yeast may be either yeast or yeasts.
The plural of antenna may be antennae (Latin plural) or antennas.
Had may be singular or plural. --- No! We use had if the noun is singular and we use have if the noun is plural! TY!ural.
The word buffalo may be singular or plural. The plural of buffalo, according to several sources, may be buffaloes or remain as buffalo.(The word bison is listed as a plural noun, but is often used as a singular noun.)