Sorry for slow take on your question, not often in to G2G;
Briefly - 1901,1911 Census give Frank's birthplace as "Dublin" , not "Dublin, Ireland" whereas the 1921 Census transcript stated "Dublin, Suffolk" which took some Googling to find out it was a tiny hamlet in the 1800's and seemingly not any bigger now. Jim Richardson has just suggested an Earl of Suffolk (Charles Howard) had son, & grandson Greville Howard - a clue I have yet to explore fully.
The correct 2nd name for Frank's daughter (my mother) is Isoult.
Thanks for querying details.
Phil P