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Their brother's name was Seth, but he was born a few years after Cain killed Abel, and he was banished for his crime. (Genesis 5.3)
If you go by the Bible its Cain and Able. They are suppose to be the first siblings and Cain kills Able because God prefers Ables sacrifice.
Cain is Able's younger brother. In the Bible, they are two of the sons of Adam and Eve. Cain is known for killing his brother Abel out of jealousy.
Eve
Cain is a Bible name
Ace Cain's birth name is Horace Truman Cain.
Lynn Cain's birth name is Lynn Dwight Cain.
Sam Cain's birth name is Sam Wayne Cain.
Lamont Cain's birth name is LaMont Terome Cain.
Krisinda Cain's birth name is Krisinda Jeanette Cain.
Haven Cain's birth name is Haven Jude Cain.
Erin Cain's birth name is Erin Elizabeth Cain.