OAKLEY:  from the oak-tree meadow

OCELFA:  from the high plain

ODELL, ODALE, ODAYLE:  of the valley

ODOM, ODAM:  son-in-law

ODWULF, ODWOLF, ODWOLFE:  wealthy wolf

OGDEN, OAKDEN, OGDON:  from the oak-tree valley

OGELSBY, OEGELSBY, OGELSVY, OGELSVIE:  fearsome

OLIVER, OLLIE, OLLIVER: peaceful

ORBAN: born in the city

ORCUS: myth name (the underworld)
ORSON: bear
OLNEY, OLLANEG:  from Olney

ONSLOW, ONSLOWE:  from the zealous one's hill

ORAM, ORAHAMM, ORHAM:  from the riverbank enclosure

ORFORD:  from the cattle ford

ORLAN, ORDLAND, ORLAND:  from the pointed hill

ORMAN, ORDMAN:  spearman

ORMEMAN:  ship man

ORMEMUND, ORMUND, ORDMUND, ORMOND:  spear-defender

ORRICK, ORIK, ORICK, ORRIK, HARAC:  from the ancient oak tree

ORSON, ORSEN, ORDSONE:  Ormond's son

ORTON, ORTUN, ORATUN:  from the shore farm

ORVAL, ORVIL, ORVILLE, ORDWALD, ORWALD:  spear-strength

ORVIN, ORVYN, ORDWIN, ORDWINE:  spear-friend

OS, OZ:  divine

OSBERT, OSBURT, OSBART, OSBEORHT:  divinely brilliant

OSBORN, OSBURN, OSBOURNE, OSBEORN:  divine warrior

OSMAR, OSMARR:  divinely glorious

OSMOND, OSMUND, OSMONT:  divine protector

OSRED, OSRID, OSRYD, OSRAED:  divine counselor

OSRIC, OSRIK, OSRICK:  divine ruler

OSWALD, OSWEALD, OSWELL:  divinely powerful

OXFORD, OXNAFORD:  from the ox ford

OXLEY, OXNALEAH:  from the ox enclosure

OXTON, OXNATUN:  from the ox farm