Multiple realities(covers information from several alternate timelines)
Andrei Chekov 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 dialog or scripts. His name is solely derived from the traditional Russian patronymic "Andreievich," first mentioned in "The Way to Eden".
According the non-canon video game Starship Creator, Andrei Dimitrievich Chekov was married to Larisa Chekov. He was also mentioned as Chekov's father in the 2002 novel Future Imperfect.
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