Where did the people come from that Cain was afraid of, and the woman he eventually married?

Answer 1

MANKIND ADAM
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Most have read when Cain talked with Abel and in the field killed him.
Gen.4:8 And Cain talked with Abel his brother: and it came to pass, when they were in the field, that Cain rose up against Abel his brother, and slew him.
God then cursed and drove Cain out, and Cain said.
Gen.4:14 Behold, thou hast driven me out this day from the face of the earth; and from thy face shall I be hid; and I shall be a fugitive and a vagabond in the earth; and it shall come to pass, that every one that findeth me shall slay me.
WHO IS CAIN WORRIED ABOUT?
Gen.4:17 And Cain knew his wife; and she conceived, and bare Enoch: and he builded a city, and called the name of the city, after the name of his son, Enoch.
WHERE DID CAIN FIND A WIFE?
The answer is in the Hebrew text of (Gen.1:26 and Gen.2:7).
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MANKIND
Gen.1:26 And God said, Let us make man in our image, after our likeness: and let them have dominion over the fish of the sea, and over the fowl of the air, and over the cattle, and over all the earth, and over every creeping thing that creepeth upon the earth.
The word “man” (Gen.1:26) in the Hebrew text looks like this ( אדם ), with no article means “MANKIND”, transliterated is (adam).
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ADAM
Gen.2:7 And the LORD God formed man of the dust of the ground, and breathed into his nostrils the breath of life; and man became a living soul.
The word “man” (Gen.2:7) in the Hebrew text looks like this ( את־האדם ), with article and particle means “THIS SAME MAN ADAM”, transliterated is (eth-Ha adham).
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On the sixth day God created or made MANKIND.
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On the eighth day God formed THIS SAME MAN ADAM.
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Answer 2

Brothers and Sisters. Aunts, uncles, cousins.

The incident of of the murder of Abel is not dated but most opinions believe it is before Adam and Eve had more children. That said, there are hints in the Hebrew text that Cain and Abel each had one or more twin sisters. Further, Adam is said to have had 'sons and daughters' and in 930 years, that could be quite a few.

Answer 3

At the time that Cain killed his brother, they were adults and they had siblings. He was afraid that one of his other siblings would kill him because he had killed Abel. Cain may already have been married to one of his sisters, but if not, he would have taken one of them with him as his wife.

Answer 4

The Bible says Adam and Eve were the first human creations of God. Not the ONLY creations.

I'm not convinced the story of Adam and Eve are meant to be taken literally, but there is that explanation.

Answer 5

Caves.