m glad atleast there is something linked to mother ...i believe at least half things should be linked to mother..like middle name can be mother's since surname is father's..by that way child would have both mother's and father's identity ..
as far as your question is concerned
The term "mother tongue" should not be interpreted to mean that it is the language of one's mother. In some paternal societies, the wife moves in with the husband and thus may have a different first language than the husband. Mother in this context probably originated from the use of "mother" as origin; as in mother-country or mother-land.