Com­ment­ary on ex­tramar­it­al pa­tern­ity and sur­name de­term­in­a­tion in re­gis­tra­tion in sur­rog­acy cases

De­vel­op­ment sum­mary

Aurora Hernán­dez Rodríguez con­siders the es­tab­lish­ment of non-marital pa­tern­ity for a child born in Prague through sur­rog­acy, the de­term­in­a­tion of sur­names on re­gis­tra­tion of the birth in the Span­ish Civil Re­gister, and the restricted-publicity regime. The art­icle com­ments on Bizkaia Pro­vin­cial Court judg­ment no. 559/2025 of 19 Septem­ber 2025, which al­lowed the public pro­sec­utor’s appeal against the Bilbao Court of First In­stance No 2’s de­cision fully grant­ing a Span­ish na­tion­al’s claim for pa­tern­ity and re­gis­tra­tion of the child with the father’s two sur­names. The gest­a­tion­al mother, who was also the legal mother under Span­ish law, had re­nounced rights arising from ma­ter­nal af­fil­i­ation and sought ap­plic­a­tion of the restricted-publicity regime under civil-registration le­gis­la­tion.