Russian Кукушкин (Kukushkin) means 'belonging to the cuckoo' — кукушка is 'cuckoo' (named after its call). The Chinese transliteration captures the four-syllable Russian rhythm:
库 'ku',
库 'ku',
什 'sh',
金 'kin'. The doubled
库库 is the dead giveaway of a Russian -kuk- root. Compare
普希金 'Pushkin' for the same '-kin' ending →
金.
