Rowan

From an Irish surname, an Anglicized form of Ó Ruadháin meaning "descendant of RUADHÁN". This name can also be given in reference to the rowan tree.

RUADH   male   Irish, Scottish
Gaelic byname meaning "red", often a nickname for one with red hair. This was the nickname of the Scottish outlaw Raibeart Ruadh MacGregor (1671-1734), known as Rob Roy in English.
EQUIVALENTS
ENGLISH: Rowan
IRISH: Rowan
FEMININE FORMS
ENGLISH: Rowanne
OTHER FORMS
DUTCH: Roy
ENGLISH: Ormond, Ormonde, Roy
IRISH: Ruadh, Ruadhán
SCOTTISH: Roy, Ruadh