I do not know why Davis would have his original surname that he hadn't used in 30 years show up on that manifest, but I can tell you that my husband's ggf who arrived in NYC in the early 1880's and had used the surname SOLON for 60 years, had the original surname SOKOLSKY used on his NYC death certificate. On his tombstone both surnames were inscribed.
Why would a surname that he hadn't used in 60 years be used at that point in time? It is a mystery.
Searching: RATOWSKY / CHAIMSON (Ariogala / Ragola, Lith.)
WALTZMAN / WALZMAN (Ustrzyki Dolne / Istryker, Pol.)
LEVY (Tyrawa Woloska, Pol.)
LEFFENFELD / LEFENFELD (Daliowa/ Posada Jasliska, Pol.)
BOJDA (Tarnobrzeg, Pol.)
SOKALSKY / SOLON FINGER(MAN) (Grodek, Bialystok, Pol.)
BOBISH / APPEL (Odessa)