Sister and brother names are female and male names that are so closely related they feel like (but aren’t always) variations of the same name.
In this age of gender fluidity, we see this happening more and more: girl names becoming more popular on the strength of a similar-sounding boys’ name, or boy names whose star rises on the stylishness of a girl name.
It doesn’t really matter, in the end, which gender’s popularity comes first. More and more, related male and female versions of a name rise hand-in-hand through the popular names charts.
There was one pair of perfectly paired twin names: Isabel Therese and Leo Henri. Unusual names included Winry, Geddy, Hercule and Woods, plus middles Obelia and Calloway, and sibs Blythe Lavender, Ignatius Peter, Indigo Robert and Hespera Catherine Ophelia. Wow!