Hi
According to the 1841 census his parents were Robert and Ann Holmes, living at Church End, Great Catworth. His birth certificate would give you Ann's maiden name.
Robert Holmes M 25 farmer
Ann Holmes F 25 Huntingdonshire
Susanna Holmes F 5 Huntingdonshire
William Holmes M 3 Huntingdonshire
Robert Holmes M 2 Huntingdonshire
John Hales M 20 Huntingdonshire
Emma Bungian F 14 Huntingdonshire
Jan