Kerr was born on 16 August 1891, the only son of Lieutenant-Colonel Sir Russell Kerr, and his wife Lady Kerr, of Newnham on Severn, Gloucestershire.
Ralph Waldo Emerson | Ralph Lauren | Ralph Nader | Ralph Vaughan Williams | Ralph Fiennes | Ralph Steadman | Ralph Macchio | Ralph Bunche | Ralph Bakshi | Ralph Richardson | Ralph Stanley | Ralph McTell | Ralph Ellison | Deborah Kerr | Ralph Jordan | Ralph | Ralph Abercromby | Ralph Molnar | Ralph Records | Ralph Peterson, Jr. | Ralph Klein | Ralph H. Fowler | Miranda Kerr | Jim Kerr | Ralph Tresvant | Ralph Moore | Arthur Francis George Kerr | Ralph Wilson | Ralph Terry | Ralph "Shug" Jordan |
The heir presumptive to the marquessate is the 13th Marquess younger brother Lord Ralph Kerr, who owns Ferniehirst Castle, Jedburgh, Roxburghshire, which is an ancient family seat that was restored by the 12th Marquess, and Melbourne Hall in Derbyshire.