Civil Registration Indexes (Births)
Probably:

William Gregory Ibberson, reg. 1st quarter of 1902, Ecclesall Bierlow, Yorkshire West Riding, England.
William Ibberson, reg. 3rd quarter of 1902, Dewsbury, Yorkshire West Riding, England.
Wilfred Ibberson, reg. 4th quarter of 1903, Rotherham, Yorkshire West Riding, England.
Wilfred Ibberson, reg. 3rd quarter of 1905, Dewsbury, Yorkshire West Riding, England.
William Ibberson, reg. 4th quarter of 1905, Ecclesall Bierlow, Yorkshire West Riding, England.
Wilfred Ibberson, reg. 2nd quarter of 1908, Huddersfield, Yorkshire West Riding, England.
William Ibberson, reg. 1st quarter of 1909, Ecclesall Bierlow, Yorkshire West Riding, England.
William Ibberson, reg. 2nd quarter of 1910, Barnsley, Yorkshire West Riding, England.
Walter Ibberson, reg. 3rd quarter of 1912, Dewsbury, Yorkshire West Riding, England.