The date of Cirion's birth appears only in The History of Middle-earth volume XII, The Peoples of Middle-earth. It cannot therefore be considered completely reliable.
2
The elements of Cirion's name are not difficult to parse, but their combined meaning is hard to interpret. Cir- literally means 'cut, cleave', but was often used figuratively to mean 'ship', while -ion usually means 'son'. Given that his father Boromir died early due to a Morgul-wound, the name Cirion may imply something like 'wound-son' (because he inherited due to his father's wound).
The alternative 'ship-son' is perhaps the more natural reading, but we have almost nothing in Cirion's biography to associate him with ships. The exception is a brief reference that his coasts were harried by Corsairs during his time as Steward, though this hardly seems significant enough to commemorate in the Steward's name.
The date of Cirion's birth appears only in The History of Middle-earth volume XII, The Peoples of Middle-earth. It cannot therefore be considered completely reliable.
2
The elements of Cirion's name are not difficult to parse, but their combined meaning is hard to interpret. Cir- literally means 'cut, cleave', but was often used figuratively to mean 'ship', while -ion usually means 'son'. Given that his father Boromir died early due to a Morgul-wound, the name Cirion may imply something like 'wound-son' (because he inherited due to his father's wound).
The alternative 'ship-son' is perhaps the more natural reading, but we have almost nothing in Cirion's biography to associate him with ships. The exception is a brief reference that his coasts were harried by Corsairs during his time as Steward, though this hardly seems significant enough to commemorate in the Steward's name.