I thought the same about
William Francis George! But
William on its own is so popular that it could "fit" with more trendy or popular names as well as with traditional names.
Francis and
George were the names of the two grandfathers in the BA. Siblings may be from a previous marriage but that wasn't obvious from the BA.
I'm going to guess Yiyi is a Chinese name by the names of
Owen's parents and grandparents and his last name (one set of grandparents was listed as residing in
Hong Kong)
Daya
Rose's parents were of an Indian background.