Family name Gainus (Gainus 
) , all around the world, is a rare cognomen. The family name Gainus is habitual in Romania, where it is a rare surname, the United States, where it is a very rare surname, and Malaysia, where it is an extremely rare surname. Much less frequently, Gainus is the forename as well as the last name.
Kim, Adrian, Ashley, Cheryl, Bettye, Bianca, Rhonda, Garmon, Gladys, Leslie, Jaresa, Johnny, Teresa, Edwina, Omarii, Majorie, Michael, Shneshia, Asteria, Darlene, Dianthe, Lindsay, Serita, Irene, Evant, Emily, Rex, Jon, Tim, Adam, Cory, Rose, Ruby, Scott, April, Chris, Timothy, Betty, Bobby, Billy, Karen, Robin, Roger, Danny, Larry, James, Tommy, Terry, Betsy, and Nicolae