An Elf-lord who was a famous ship builder, whose name was translated “Shipwright” (LotR/240). His name is simply círdan “shipbuilder” used as a name (Ety/KIR).
Conceptual Development: In Lord of the Rings drafts from the 1940s, his name was first given as N. Cirdan with a short i (WR/76). His name appeared in The Etymologies as C(e)irdan (Ety/TAN), where the (e) probably indicates its development from N. ceir “ship” (later S. cair).
A Sindarin word for “shipbuilder” or “shipwright”, most notably used as a name for Círdan of the same meaning (LotR/240; PE17/27). It was clearly a combination of cair “ship” [< ✶kiryā] and tân “builder, wright”. The Etymologies of the 1930s instead had N. cirdan “shipbuilder” with a short i (Ety/KIR), while the name was given as N. C(e)irdan [containing N. ceir “ship”] making its etymology clear (Ety/TAN). Cirdan’s name appeared with either a short i or long í in Lord of the Rings drafts of the 1940s (WR/76; SD/67).
Conceptual Development: The first version of the Tengwesta Qenderinwa (TQ1) of the 1930s had another word N. ciriaeth “shipwright” derived from ᴹ✶kirya-k’tō (PE18/62), but it was never used as a name.
Neo-Sindarin: For purposes of Neo-Sindarin, I think both círdan and ciriaeth can coexist, with the círdan referring to the principle designer or builder of the ship, and ciriaeth for other workers helping build the ship.