There were some birth register entries for children of John and Esther Morell in Lenox, MA, including an Alva.
Massachusetts, Town and Vital Records, 1620-1988 about Alva Morell
Name: Alva Morell
Event Type: Birth
Birth Date: 26 Nov 1790
Birth Place: Lenox, Massachusetts
Father Name: John Morell
Mother Name: Esther
There was also an Alvah Morell that shows up in the 1820 Census in Lenox.