RAGHNALL: Irish Gaelic form of Old Norse Rögnvaldr, meaning "wise ruler."
REAGAN: Irish surname transferred to unisex forename use, derived from an Anglicized form of Gaelic Ó Riagáin, "descendant of Riagán," hence "furious, impulsive."
RÉAMANN: Irish Gaelic form of English Raymond, meaning "wise protector."
RÍOGHBHARDÁN: Old Irish name composed of the Gaelic elements ríogh "king," bard "poet," and a diminutive suffix, hence "little poet-king."
RÍOGHNÁN: Irish name composed of the element ríogh "king" and a diminutive suffix, hence "little king."
RISTÉARD: Irish Gaelic form of Old High German Ricohard, meaning "powerful ruler."
ROBAN: Pet form of Irish Gaelic Roibéard, meaning "bright fame."
ROIBÉARD: Irish Gaelic form of Norman French Robert, meaning "bright fame."
RÓNÁN: Irish Gaelic name composed of the word rón "oath, seal" and a diminutive suffix, hence "little oath, little seal."
RÓRDÁN: A derivative of Irish Gaelic Ríoghbhardán, meaning "little poet-king."
ROWAN: Irish surname transferred to forename use, derived from an Anglicized form of Gaelic Ruadhán, meaning "little red one." Compare with feminine Rowan.
ROY: Pet form of Irish Gaelic Roibéard, meaning "bright fame." Compare with other forms of Roy.
RUADH: Old Irish byname derived from Gaelic ruadh, meaning "red."
RUADHÁN: Diminutive form of Irish Gaelic Ruadh ("red"), hence "little red."
RUAIDHRÍ: Irish Gaelic name composed of the Celtic elements ruadh "red" and rí from ríogh "king," hence "red king."
RUAIDRÍ: Variant spelling of Irish Gaelic Ruaidhrí, meaning "red king."
RUAIRÍ: Variant spelling of Irish Ruaidhrí, meaning "red king."
RYAN: Irish surname transferred to forename use, from an Anglicized form of Gaelic Ó Riain ("descendant of Rian"), hence "little king."
REAGAN: Irish surname transferred to unisex forename use, derived from an Anglicized form of Gaelic Ó Riagáin, "descendant of Riagán," hence "furious, impulsive."
RÉAMANN: Irish Gaelic form of English Raymond, meaning "wise protector."
RÍOGHBHARDÁN: Old Irish name composed of the Gaelic elements ríogh "king," bard "poet," and a diminutive suffix, hence "little poet-king."
RÍOGHNÁN: Irish name composed of the element ríogh "king" and a diminutive suffix, hence "little king."
RISTÉARD: Irish Gaelic form of Old High German Ricohard, meaning "powerful ruler."
ROBAN: Pet form of Irish Gaelic Roibéard, meaning "bright fame."
ROIBÉARD: Irish Gaelic form of Norman French Robert, meaning "bright fame."
RÓNÁN: Irish Gaelic name composed of the word rón "oath, seal" and a diminutive suffix, hence "little oath, little seal."
RÓRDÁN: A derivative of Irish Gaelic Ríoghbhardán, meaning "little poet-king."
ROWAN: Irish surname transferred to forename use, derived from an Anglicized form of Gaelic Ruadhán, meaning "little red one." Compare with feminine Rowan.
ROY: Pet form of Irish Gaelic Roibéard, meaning "bright fame." Compare with other forms of Roy.
RUADH: Old Irish byname derived from Gaelic ruadh, meaning "red."
RUADHÁN: Diminutive form of Irish Gaelic Ruadh ("red"), hence "little red."
RUAIDHRÍ: Irish Gaelic name composed of the Celtic elements ruadh "red" and rí from ríogh "king," hence "red king."
RUAIDRÍ: Variant spelling of Irish Gaelic Ruaidhrí, meaning "red king."
RUAIRÍ: Variant spelling of Irish Ruaidhrí, meaning "red king."
RYAN: Irish surname transferred to forename use, from an Anglicized form of Gaelic Ó Riain ("descendant of Rian"), hence "little king."