I named Zola after Emile Zola. At the time of naming him I had recently read Zola's L'assommoir which captured my imagination -- the pathos and brutality of its characters' lives resonated with me somehow, but the main reason I loved the novel was simply the brilliant storytelling.
Roscoe was named after a song by the band, Midlake, which I listened to on loop for the better part of a year. The song similarly harks back to the past and evokes a kind of sadness... Yet, in spite of their somewhat sombre names, Roscoe and Zola are for me symbols of possibly the happiest period of my life so far.