For
It supports equality and creativity in families.
Against
It can lead to confusion in identity and records.
Anonymous excerpts, translated where noted.
“We are giving our child both of our last names.”
“This is extremely common in many cultures where people always give their children both parents’ last names.”
“I’m in the USA and it’s not common to have two last names.”
“teachers routinely fail to associate parents with different last names with their child”