Although names are most obviously involved in the identification of individuals, they also indicate a wide variety of informationabout their bearers, from gender and ethnicity to religion and beliefs. However, names may actually speak moreabout their givers than their bearers, and they can play an important role in establishing children’s positions within families.This suggests that changes in naming practices may be motivated in part by changing familial relationships, which isparticularly relevant for contemporary Japan given dramatic changes occurring in recent years. To assess these possibilities,I conducted a study on who is involved in choosing names using a corpus of parents’ messages in one Japanese municipality’snewsletter. Analysis showed that while it was most common to not ascribe any specific individual as the giver,those most commonly given were parents themselves, followed by children’s older siblings, whereas those outside of thenuclear family （e.g., grandparents） were mentioned infrequently. Combined with similar results from analyses on forwhom children were named and commonalities between names within families, I argue that these results reflect greaterchanges in the sense of private space; the role of the nuclear family therein; and increased focus on the bonds between siblings.