Across the world, Guinivan (Guinivan 
) is an extremely rare unknown gender forename. Much more frequently, Guinivan is the last name as well as the forename.
Sam, Andrew, Ashley, Callum, Kerrie, Robert, Thomas, Tracey, Nicole, Eileen, Violet, Melissa, Michael, Anthony, Annamae, Phyllis, Richard, Garrett, Jessica, Jeffrey, Timothy, Heather, Swanby, Sandra, Helen, Nancy, Ash, Tom, Mark, Sean, Beth, Kyle, Paul, Dave, Gail, Lisa, Michelle, Lucy, Joan, Neil, Eric, Susan, Steve, Carol, Ralph, Grant, James, Julie, John, and Patricia