I suspect “De Adalena” is just a poetic spin on “Adeline” – as in Adeline Guess (1896-1968), who co-owned the 1926 tract where this street originated. Born Adeline Anna Schanel in Wisconsin and raised in Iowa, she came to El Monte in 1911 when her father Joseph established the Schanel Mortuary there. She wed her first husband Clifford Barton in 1916 and had a son with him, but that marriage soon fizzled and in 1923 she joined one of Rosemead’s oldest families when she tied the knot with Francis Marion “Frank” Guess (1896-1984). Frank, a grandson of pioneer settler John Guess (see Guess Street), ran a woven wire factory while Adeline worked as flower arranger at her father’s funeral home. The couple had two kids.