Boyer: when German, can be a modification of "Bauer," farmer.
MacLachlan: Gaelic, "son of Norway." Variously spelled.
Moreau: From dark or black horse. [1] (http://www.vitalog.net) has the etymology as "French, derived from the nickname for the dark-skinned man, perhaps a Moor."
Spector: From the Russian Spectorski, meaning inspector. Jews who registered as inspectors with the Russian or Ukraine governments received a favored status with respect to travel, although those who collected taxes were generally resented in the stetls (Jewish ghettos).
... nach Königsberg (1873), which deals with his life up to the time of his settlement at Königsberg.
See Quabicker, Karl Rosenkranz (1899), and J Hutchison Stirling, ...