The Catálogo alfabético de apellidos (English: Alphabetical Catalogue of Surnames; Filipino: Alpabetikong Katalogo ng mga apelyido) is a book of surnames in the Philippines and other islands of Spanish East Indies published in the mid-19th century.

[3] The book was created after Spanish governor-general Narciso Clavería y Zaldúa issued a decree on November 21, 1849, to address the lack of a standard naming convention.

[4] Newly-Christianised Filipinos often chose the now-ubiquitous surnames of de los Santos, de la Cruz, del Rosario, and Bautista for religious reasons; others preferred names of well-known local rulers such as Lacandola.

[citation needed] To complicate matters further, discrepancies like family members holding different surnames would hinder some of the colonial government's activities such as taking a census and tax collection.

According to the decree, a copy of the catalogue, which contains 61,000 surnames,[5] was to be distributed to the provincial heads of the archipelago.