Kernrechtsfrage
Whether joint parental custody and the parents' stable household constitute, by analogy to Art. 271 Abs. 3 ZGB, a per se important reason for the child's name change.
Extrahierter Entscheid
No. Joint custody and cohabitation do not automatically justify a name change; Art. 271 Abs. 3 ZGB does not apply analogically in this situation.
Extrahierte Begründung
The law favors name immutability and Art. 30 Abs. 1 ZGB requires important reasons. The purpose of the analogical rule is to align the child's name with the custodial parent when the child actually grows up in that parent's exclusive sphere, not to create a general link between custody and surname.