The left one reads:
Feivel Zevulun, son of Yisrael, died Shvat 26, 5697
The right one:
My husband and our dear father (Rabbi) Zeev, son of Tzvi, died Shvat 10, 5697
Normally the American names started with the same letter as the Jewish.
So Feivel became Phillip. The second one, I assume, was called Wolf (translation of Zeev in German or Yiddish) and so he became William