Oak[OUK]
The oak
Oakley[OUK-li]
Oak meadow
Obadiah[oh-ba-DEI-a]
Servant of God
Oberon[O-be-ron]
Noble bear; the elf king
Ocean[O-schen]
The ocean
Océane[o-se-AN]
Of the ocean
Octave[ok-TAV]
Eighth
Octavian[ok-TA-vi-an]
The eighth
Octaviano[ok-ta-VIA-no]
The eighth
Octavio[Ok-TA-vio]
The eighth
Oda[O-da]
Heiress, wealth
Odalrich[O-dal-rich]
Rich in heritage
Odei[o-DEI]
The thunderstorm
Odelia[o-de-LI-a]
I will praise God
Odell[o-DEL]
Wooded hill
Odessa[o-DE-sa]
Long journey
Odette[o-DET]
Little wealthy one
Odhrán[OH-rawn]
Little pale-green one
Odile[o-DIL]
The prosperous one
Odilo[O-di-lo]
The wealthy heir
Odin[O-din]
Fury; king of the gods
Odysseas[o-DI-se-as]
Wrathful, hated (disputed)
Ofra[OF-ra]
Young deer, fawn
Ognjen[OG-nyen]
The fiery one
Oğuz[oh-OOZ]
Pure-hearted, legendary Turkic ancestor
Ohad[o-HAD]
He loved, cherished
Ohana[o-HA-na]
Family
Oier[O-jer]
Of the woods
Oihana[oi-A-na]
The forest
Oili[OI-li]
The holy one
Oisin[O-schin]
Little deer
Oksana[o-KSA-na]
The hospitable one
Ola[O-la]
Ancestor's heir
Olaf[O-laf]
Ancestor's heir
Olalla[O-LA-ya]
The well-spoken one (Galician form of Eulalia)
Olan[O-lan]
The stag
Olander[o-LAN-der]
The olive tree
Olatz[o-LATS]
Place of pastures, title of Mary
Olav[O-laf]
Ancestor's heir
Olavi[O-la-vi]
Ancestor's heir
Ole[O-le]
Ancestor's descendant
Oleg[o-LEK]
The holy one
Olena[o-LE-na]
The shining one
Olga[OL-ga]
The holy one
Olimpia[o-LEEM-pya]
Of Mount Olympus, heavenly
Olive[O-liv]
Olive; peace
Oliver[O-li-ver]
Olive tree, peace
Olivia[o-LI-vi-a]
Olive tree, peace
Olivier[o-li-VI-e]
The olive tree
Ollie[O-li]
Olive branch
Olwen[OL-wen]
White footprint
Olympia[o-LIM-pia]
Of Olympus, heavenly
Omar[O-mar]
Flourishing, long-lived
Ombretta[om-BRET-ta]
Little shadow
Omid[O-MID]
Hope
Omkar[OM-kar]
The sacred syllable Om
Omri[OM-ri]
The sheaf
Onda[ON-da]
The wave
Onni[ON-ni]
Happiness, luck
Onno[O-no]
The forefather
Onofre[O-NO-fre]
He who protects his own well-being
Onufri[o-nuf-RI]
The sacred bull
Onur[o-NUR]
Honour
Onyx[O-niks]
The black gemstone
Oona[U-na]
The lamb; the one
Opal[O-pal]
The opal
Ophelia[o-FE-li-a]
Help, aid
Ora[O-ra]
Light
Orazio[o-RA-tsyo]
Keeper of the hours
Oren[O-ren]
The pine tree
Orenda[o-REN-da]
Spiritual power
Orestis[o-RES-tis]
Mountain man
Ori[O-ri]
My light
Orianna[o-ri-A-na]
Golden; dawn
Orin[O-rin]
The pale one; river
Orina[o-RI-na]
The pale river
Orion[o-RI-on]
The hunter, constellation
Orla[OR-la]
Golden princess
Orlando[or-LAN-do]
Famous land
Orley[OR-li]
God is my light
Orly[OR-li]
Light is mine
Orna[OR-na]
Light, cedar tree
Ornella[or-NE-la]
The flowering ash
Oro[O-ro]
Gold
Orpheus[OR-fe-us]
Darkness of night (disputed)
Orsolya[OR-scho-ja]
Little she-bear
Ortensia[or-TEN-sya]
Garden, hydrangea
Ortlind[ORT-lind]
Gentle point
Ortrun[ORT-run]
Point-secret
Ortwin[ORT-win]
Point-friend
Orvokki[OR-vok-ki]
The violet (flower)
Osamu[O-sa-mu]
The one who governs
Osbert[OS-bert]
Divinely bright
Oscar[OS-kar]
Spear of the gods
Osian[OSH-an]
Little deer (Welsh form of Ossian)
Osiris[o-SI-ris]
God of rebirth
Oskar[OS-kar]
Spear of the gods
Oskari[OS-ka-ri]
The divine spear
Oslo[OS-lo]
Meadow of the gods
Osman[OS-man]
The fledgling; the founder
Osmund[OS-mund]
God's protection
Osnat[os-NAT]
Belonging to the goddess (Egyptian, biblical)
Ossi[OS-si]
Divine power
Ostap[os-TAP]
The steadfast, fruitful one
Osvaldo[Os-VAL-do]
Ruled by God, divine power
Oswald[OS-valt]
Divine power
Oswin[OZ-vin]
Friend of God
Otbert[OT-bert]
Wealthy and bright
Otis[O-tis]
The prosperous one
Otso[OT-so]
The bear
Ottar[OT-tar]
The dread warrior
Ottavia[ot-TA-via]
The eighth
Ottavio[o-TA-vi-o]
The eighth-born
Ottilia[o-TI-li-a]
The wealthy heiress
Ottilie[o-TI-li-e]
The prosperous heiress
Otto[O-to]
The prosperous one
Ottoline[OT-to-li-ne]
Little wealth
Otwin[OT-win]
Wealthy friend
Ovadia[o-va-DI-a]
Servant of God
Ove[O-ve]
Sword point; heir
Owen[O-wen]
Well-born; youth
Oz[OZ]
Strength
Ozan[o-SAN]
The bard