This name is wrong he is actually Sgt John David MURRAY born Kennedy Saskatchewan, Canada
9 Apr 1919 -

Name: John David Murray
Gender: Male
Birth Date: 9 Apr 1919
Birth Place: Kennedy, Saskatchewan, Canada
John David Murray
Winnifred Alice Smith

NOT 9 April 1917 as per

WO 416/267/106
which has
John David Kennedy Murray Canada Royal Canadian Air Force Flight Sergeant unspecified R68191 with DoB 9 April 1917 a

The confusion of his name is based on the place of birth
German Pow Record also has

Murray John David,
Sgt., DOB.9.4.1917 in Kennedy, Saskatchewan R 68191,
Captured 28-4-1942

Possible he added 2 years to his age on joining up ??