Multiple realities(covers information from several alternate timelines)
Andrei Chekov (Андрей Чехов) was a Human of Russian descent who lived in the 23rd century. (TOS: "The Way to Eden")
In 2245, Chekov's only son, Pavel Andreievich Chekov, was born. (TOS: "Who Mourns for Adonais?", "Day of the Dove")
In an alternate reality that branched off in 2233, Chekov's son, Pavel, was born in 2241. (Star Trek)
Andrei Chekov was never mentioned in dialogue or scripts. His name is solely derived from the traditional Russian patronymic "Andreievich," first mentioned in "The Way to Eden".
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