This one is tough as I think its clearly a misspell. However rooting in the twigs I come up with an Evert/Everad Macane/McCave/Mcormac in Richmond, Howard County with his sister in the Thomas Frisby household. This is a tangled web as in 1850 he is listed as Evert Haney in the John Frisby household in Chariton County and in 1859 his older sister married Daniel McCormick/McCormac/McCarmac. So "Sandy" sounds better than Evert and he always carried his sister's last name around on census reports so maybe he really didn't know where he was from he also would have been just 18 years old. I am guessing here....out loud which is dangerous I know.

1860 Census
Name: Everard Macane
[Evert McCave]
Age: 14
Birth Year: abt 1846
Gender: Male
Race: White
Birth Place: Missouri
Home in 1860: Richmond, Howard, Missouri
Post Office: Fayette
Dwelling Number: 145
Family Number: 138
Household Members Age
Thomas Frisby
47
Judah Frisby
45
Edward A Frisby
16
Saunders Frisby
Emaline Frisby
8
Lewis Frisby
6
Rasmus Frisby
2
Everard Macane 14
Ann E Macane
16