FindMyPast, which in many ways is now better than Ancestry, has British India Office Births & Baptisms...... Diana Hope H(e)y-Neave, birth date 20th Nov. 1918, baptised 30th Dec 1918, Bengal.
There is also a death date for a Anne Elizabeth Hay-Neave, b.1916, of 31st Aug 1919, St John's, Meerut, Bengal. Also a birth for Griselda Nancy Hay-Neave, 22nd Nov. 1920, bapt. 26th Dec. 1920 to E R & A C Hay-Neave at Meerut, Bengal.
Diana also lost her brother, Flying Officer Peter Arundell Hay-Neave, in 1943. He was killed in an air crash in Sussex on the 11th Nov.
FMP has a Michael Roman Habdank-Kolaczkowski, b. 1984, reg. 1987 in Los Angeles (GRO Births Abroad Indices), mother's maiden name Habdank- Kolaczkowska.