The only one I can see in the vicinity is the same.
MARS, FREDERICK HENRY - 1857 D Quarter in BARNSTAPLE UNION Volume 05B Page 442
1861 census, his mother has wed.
(probably Jul-Aug-Sep 1860 Barnstaple, Devon, England
Volume 5B
Page 790
Line Number 16
https://www.familysearch.org/ark:/61903/1:1:MWM3-ZGMDAVEY, CHARITY BAMENT 1861 J Quarter in BARNSTAPLE UNION Volume 05B Page 496
DAVEY, JANE BALMENT 1862 S Quarter in BARNSTAPLE UNION Volume 05B Page 479
DAVEY, ANN THIRZA BALMENT 1864 S Quarter in BARNSTAPLE UNION Volume 05B P 483
DAVEY, GEORGE BALMENT 1865 S Quarter in BARNSTAPLE UNION Volume 05B Page 468
DAVEY, JOHN BALMENT 1869 D Quarter in BARNSTAPLE UNION Volume 05B Page 488
1871 (no Frederick)
https://familysearch.org/ark:/61903/1:1:V5TY-72N