Cf. Korean naming tradition, which is highly formalized (to the extent that almost everybody's given name is precisely 2 syllables), siblings often share a syllable, either the first or the second. E.g. sister 지현(Ji Hyun) and brother 지원(Ji Won), or two sisters named 민주(Min Ju) and 영주(Yŏng Ju).
"On July 3, 2006, Amanda gave birth to fraternal twin girls, and the ecstatic parents gave their daughters intertwined names: One would be Millie Marcia Madge Biggs, the other Marcia Millie Madge Biggs."