In the entire world, Sigei (Sigei 
, シゲイ 
) is an extremely rare feminine first name. More frequently, Sigei is the last name as well as the forename.
Mr, Peter, Roger, Remmy, Denis, David, Diana, Lorna, Loice, Janet, Jonah, Tammy, Nixon, Edwin, Erick, Enock, Evans, Henry, Faith, Frank, Felix, Isaac, Kibet, Brian, Betty, Asbel, Sam, Ben, Dan, Eli, Ebs, Ian, Mary, Mike, Asha, Paul, Willy, Ruth, John, Joel, Jodi, June, Theo, Tony, Eric, Mercy, Milka, Sammy, Dion, and Mathew