The 1763 trees, as summarised in the article, list this child of Alonso López de Baamonde and Beatriz Sarmiento.

Source occurrence
Lope García Sarmiento
Explore names on the mapRole in this source: Mentioned in the source
A son of Alonso and Beatriz, cantor of Tui cathedral.
Claims & citations
The 1763 trees list this child of Beatriz Sarmiento and Alonso López de Baamonde.
Record
The house of Regodeigón · published study
Ernesto Iglesias Almeida, “La Casa de Regodeigón, en tierras do Ribeiro”, pp. 407–415
A local-history article on the Puga and Baamonde house of Regodeigón. It follows Crespo Pozo, Blasones y linajes de Galicia (1982), for the first generations and the family trees in the 1763 lawsuit over the benefice of Regodeigón (diocesan archive of Tui-Vigo) for the later ones, noting that Crespo’s later generations are unreliable. Secondary: links from it are candidates.
Source detailsPublic archival link pending