“Spier” or “Spire”—Which to use?

…sold the property to Robert Spier's widow, Margaret Gibson Spier.
…1904 by the Detroit firm Spier & Rohns.
…(2002) Computers and Society, in: Spier, R.E., (editor), Science and Technology…
…designed by the architectural firm Spier and Rohns, built in 1904…

…long, or longer, than the spire, fortified externally by a stout…
…the Totem Pole, a rock spire with an diameter.
…form a smooth, depressed helicoid spire, which is obliquely three-fifths immersed…
…fusiform shell has an acute spire.
…large dormer windows and a spire to the central section.
…seven whorls of the short spire are compressed, slightly shouldered by…
It has a "recessed octagonal spire with crocketed arrises and pinnacled…
Pitou, Spire (1985), The Paris Opéra.
…whorl is shorter than the spire.
…shaped sails on the 78-meter spire titanium was depicted on the…

(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)

“Spier” or “Spire”