Maybe. With such limited information its hard to be sure.
Is this his birth record ?
Name: PHIBBS, Brian D O
Registration district: Merioneth South
Year of registration: 1937
Quarter of registration: Apr-May-Jun
Mother's maiden name: Bickersteth
Volume no: 11B
Page no: 470
It is the only PHIBBS with a forename beginning with D born in Wales between 1920 and 1990.