Frequency - Word Form
  34 o
   1 oaddey
   1 oaiagh
   5 oaiaghyn
  32 oaie
   1 oaldey
   5 oalsey
   1 oanluckee
  11 oanluckey
   2 oanluckit
   6 oardagh
   7 oardaghey
   5 oardaghyn
   1 oardit
   2 oarn
   1 oaseir
   4 obbal
   1 obbee
   1 obbragh
   3 obbraghey
  35 obbraghyn
   2 obbree
  12 obbyr
   3 obbys
   3 obed
 158 oc
   6 ockle
   4 ockley
   1 ockley-magh
  22 ocsyn
   5 oddagh
   1 oddin
   3 oddym
  30 oddys
   1 offishearyn
   2 oghe
   1 ogher
   1 ogheryn
   7 oghrish
  10 oghsan
  32 oi
   1 oï
  23 oie
   3 oieghyn
   2 oik
   4 oikan
   3 oikanyn
   1 oill
  12 oirr
   8 oliveyn
  29 olk
   3 olkys
   1 ollagh
   3 oltaghey
   5 oltaghey-bea
   3 oltooan
   2 oltooaney
   1 oltooanit
   1 oltyn
   4 ommijagh
   2 ommydan
   1 oney
   1 onnaneyn
   1 onneragh
   5 onnor
 241 oo
   2 oo-hene
   1 ooashey
   4 ooashlaghey
  50 ooashley
   1 ooashleyderyn
  14 ooasle
   1 ooh
   3 ooig
  15 ooil
   1 ooilaghey
   6 ooillaghey
 307 ooilley
   1 ooilley-niartal
   1 ooilliagh
   1 ooilyn
   6 ooir
   1 oolee
   1 oonlaghey
   2 oonlee
  57 oor
   1 ooraghey
   6 order
  15 orrin
   5 orrinyn
  77 orroo
   9 orroosyn
  72 orrym
   2 orryms
  46 ort
   1 ort-agh
   1 os
   6 osley
   2 osney
   1 ostjllyn
  32 ostyl
 107 ostyllyn
 141 ou
   9 oural
   3 oural-millish
   3 ourallyn
   1 ourys
   1 ouyr
   1 owse
  16 oyr
   2 oyryn
   2 ozias