Paddy (Nobleman)

Padraig (Noble)  

Padriac (Nobleman)

Páidín  

Pål (the small one)

Parthalán  

Pat (Nobleman)

Patrick (Nobleman)

Peadar  

Peatáin  

Phelan (Brave)

Phelim (Good forever)

Pierce (Form of Piers from Peter)

Pilib  

Pol (Small)  

Preastún  

Proinséas  

Quillan (A cub)

Quinlan (Athletic)

Quinn (Wise)

Radhulbh (Wolf Counsellor)  

Radmund (Counsellor, Protector)

Raferty (Prosperity wielder)

Raffarty (Prosperity wielder)

Rafferty (Prosperous)

Ragahallach (Valiant)

Ragallach (Irish king, Irish hero)

Raghallaigh  

Raghnall (Wise)

Ragnall (Gawain's wife)

Ragnvald (Powerful Judgement, Well advised Ruler)

Raighne (Mighty)

Ránall  

Randal (Wolf shield, Shield rim)

Rannal (King, Powerful, Mighty)

Raonal (Advice, Decision ruler)

Raymond (Protective hands, Decision protector)

Raymun (A Wise protector)

Reagan (Little king)  

Reagen (Little king)

Reamann (Wise protector)  

Reamonn (Protective hands, Decision protector)  

Reardan (Bard, Minstrel)

Rearden (Poet)

Reardon (Poet)

Rechtabrat (Straight browed)

Redmond (Wise)

Redmund (Counsellor, protector)

Reegan (King, Heir)

Reel (Saint's name)

Regan (Descendant of a king)

Regen (Little king)

Regin (Ruler's advisor, Rule, Sovereign)

Reginald (Ruler's advisor)

Reidhachadh (From the smouth field)

Reilley (Rye, Form of Ryley)

Reilly (Descendant of a king)

Renny (Small but powerful)

Revelin (Form of Roland, Famed throughout the land)

Reynald (Counsellor ruler, rules with counsel)

Reynolds (Surname)

Rhyne (Little king)

Rí  

Riagain (Impulsive, Furious)

Riagan (Little king)

Riaghail (Saint's name)

Riaghan (Little king)

Riain (Little king)

Rian (Little king)  

Ricard (Powerful leader)

Richardd (Powerful leader)

Riddoc (From the smooth field)

Riddock (From the smouth field)

Rígan (King)

Rigbardann (Royal poet)

Rigr (King)

Riley (Valiant)

Riobárd (Royal bard)

Riobart (Bright fame)

Riocaird (Powerful leader, Powerful ruler)

Rioghan (Great queen)

Rioghbhardan (Royal poet)

Rion (Kingly)  

Ríonach  

Riordain (Bright)

Riordan (Poet)

Risteaird (Powerful ruler, Strong power)

Risteard  

Roan (Little red-haired one)

Roane (Red-haired, Red)

Roark (Famous ruler, Illustrious and mighty)

Roarke (Illustrious and mighty)

Robartach (Rushing, Impetuous)

Robert (Bright, Fame)

Robin (Bright, Fame)

Rocatos (Battle)

Rocats (Battle)

Rocatti (Battle)

Rocatus (Battle)

Rochadh (Battle)

Rodan (Fertile earth, Fertility, From the Roe-deer valley)

Roderick (Famous power, Glory)

Rodger (Famous spearman)

Rodhlann (Famous land)  

Rogan (Red-haired one)

Roger (Famous with the spear)

Rohan (Red-haired, Red)  

Roibart (Of shining fame, Bright fame)

Roibeard (Robin)  

Roibhilin (Shining fame)

Roibin (Robin|)

Roland (Renowned land)

Ron (Mountain of strength, Ruler's counselor)

Ronain (Little seal)

Ronan (Little seal)  

Ronat (Seal)

Ronit (Little seal)

Rooghan (Reddish land or red-haired)

Rooney (Red-haired)

Rorey (Red, 16th century rebel chief Rory O'More)

Rorke (Famous ruler)

Rorry (Red, 16th century rebel chief Rory O'More)

Rory (Red king)

Rós  

Roslea (Grey woods)

Ross (Wood, Red, Rose-colored, Peninsula)

Rossin (Little woods)

Rourke (Ancient Irish Clan Name)

Rowan (Red-haired, Surname)

Rowen (Red-haired)

Rowin (Red-haired)

Rowland (Famous land, Renowned in the land)

Rowney (Red-haired)

Rownun (Little seal)

Rowyn (Red-haired)

Royan (Red-haired, Red)

Ruadan (Red-haired)

Ruadhagan (Red-haired)

Ruadhan (Wolf, Hound, King)  

Ruaidhri (Fruitful, Fertile, Divinity, Bull, Dog)  

Ruaidhrigh (Red, Fame ruler)

Ruaidre (Red, King)

Ruairc (Famous king)  

Ruairi (Red, King)  

Ruanaidh (Hero)

Russell  

Ryan (Little king)  

Ryley (Valiant)

Saebhreathach (Noble Judge)

Sagranas (Chief, Ruler)

Saichairí  

Saliciduni (Willow Town)

Sameer (Ewind Breeze)

Samueil (God Heard)

Sanctan (A Saint)

Saoirbhreathach  

Saoirse (Freedom)

Saorbhreathach (Noble Of Judgement)

Scandlain (Quarrel)

Sciath (Little, Bloodred)

Scoithin (Bloom, Blossom)

Scolaidh (Crier, Town Crier, Scholar)  

Scolaighe (Herald)

Scot (From Scotland)

Scully (A town crier)

Séa  

Seabhac  

Seachnall (Second)

Seadna (Traveller)

Seafra (Peace From God)  

Seaghan (A Hawk)

Seaghda (Majestic)

Sealbéath

Seamus (James)  

Sean (John)  

Seanach (Ancient, Old)

Seanachan (Wise One)

Seanan (Old, wise)  

Séanmhar  

Searbhreathach (Judicious)

Searc (Saint, Blackbird)

Searlas (Full-Grown, Manly)

Séasán

Séat  

Seathrun (God's Peace)  

Sechnassach (Ruler's Name)

Senan (Old, wise)

Seoirse  

Seónas  

Seosamh  

Setanta (Mythical Son Of Sualtam)

Shamus (James)

Shanahan (Wise)

Shanley (Hero)

Shannon (River in Ireland)

Shaughan (God is gracious)

Shay (Stately)

Shea (Hawk-like)

Sheehan (Peaceful)

Sheridan (Wild one)

Síle  

Síomón  

Sionnach  

Siúirtán  

Skelly (Storyteller)

Slevin (Mountain climber)

Sloan (Warrior)

Sluáin  

Somhairle  

Spealáin  

Stíobhard  

Stiofan (Stephen)  

Sullivan (Blackeyed one)

Sweeney (Little hero)

Taber (Well)

Tadg (Poet)

Tadgh (A bard, Poet, Philosopher)  

Tadhg  

Tadleigh (Bard)

Taggart (Son of the priest)

Taicligh (Peaceful)

Táilliúr  

Tait (Measure of land, Surname)

Tanaide (Slender, Subtle)

Teague (Poet)

Tearnan (Lord)

Téodóir  

Terrence (Tender)

Thiarnáin  

Tiarnach (Lord, Lordly, Noble)

Tiarnan (Lord)  

Tibbot (Strong for the people)

Toirdhealbhach  

Tomás (Twin)  

Torin (Chief)

Tormaigh (Thunder spirit)

Torrance (From the knolls)

Tracy (Warlike, Fighter)

Traolach (Instigator, Abettor)  

Trasnáil  

Treabhair  

Treacy (Fighter)

Troighthach  

Trostán  

Tuathal (Ruler of the people)

Tuile  

Turlach (Aids, Assists)

Tyler  

Tyrone (County of Ireland)

Uaid (Irish form of Walter)

Uailteir (Ruler of the people)

Uaine (Born to nobility, Well born, Young Warrior)

Uainteir (Ruler of the people)

Uaithne (Green)  

Uallach (Proud)

Uallachan (Proud, Arrogant)

Ualtar (Strong fighter)  

Ualteir (Army ruler)

Uar (The cruel)

Ughaire (God is my light, My light or flame)

Uileac (Brave, Protector)

Uileag (Brave, Protector)

Uileog (Resolute protector, Resolute defender)

Uileos (Wrathful, one who dislikes in justice)

Uilis  

Uilliam  

Uinsean  

Uinseann (Conquering, Victorious, Gaining a victory)

Uisteann (Intelligent)

Ulick (Will, Desire, Helmet protection)

Ulster (Wolf)

Ultan (An Ulsterman)  

Ungus (One vigor)

Unkoo (Fierce hound)

Uri (God is my light, My light or flame)

Usheen (Little deer)

Ward (Bard)

Whealan (Joyful)

William (Strong Protector)

Zorán