My grandmother's father was Frederick Cabot Hemenway. I expect that by Earl's middle name, Frederick, that he was named after his grandfather. Frederick Hemenway served in the Civil War and later became the Sheriff of Rock Island county.
Sources
Earl Arnold is my maternal grandmother's nephew.
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DNA Connections
It may be possible to confirm family relationships with Earl by comparing test results with other carriers of his ancestors' Y-chromosome or mitochondrial DNA.
However, there are no known yDNA test-takers in his direct paternal line.
Mitochondrial DNA test-takers in the direct maternal line:
Frank Gill :
Mitochondrial DNA Test HVR1, haplogroup H