Det er stilt spørsmål om Holmes' egentlige navn, noen sier Katherine og andre Kate. Blant de sist nevnte: Janice Dunn. "Katie Holmes: A girl on the verge." Rolling Stone. Issue 795. 17. september1998. 44; Scott Lyle Cohen. "Home Sweet Holmes." Giant. Issue 5. June-July 2005. ("My name is Kate.") Caroline Graham. "What Katie Did Next." Mail on Sunday (London). 9. november2003. 30; Current Biography. On-line database accessed 8. februar2006; Andy Mangels. From Scream to Dawson's Creek: An Unauthorized Take on the Phenomenal Career of Kevin Williamson. Los Angeles: Renaissance Books, 2000. ISBN 1-58063-122-3. 177; John Griffiths. "Katie Holmes: Edging Her Way Into People's Hearts." Biography Magazine. September 2002. 88-90, 106. Fødselsattesten til Holmes's datter, Suri, benevner skuespillerinnens navn som "Kate Noelle Holmes".
