Sequel

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late Middle English (in the senses ‘body of followers’, ‘descendants’ and ‘consequence’): from Old French sequelle or Latin sequella, from sequi ‘follow’.

wiktionary

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From Middle French séquelle [1], from Latin sequela, from sequi(“to follow”).

etymonline

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sequel (n.)

early 15c., "train of followers," from Old French sequelle (14c.), from Late Latin sequela "that which follows, result, consequence," from sequi "to follow, come after, follow after, attend, follow naturally," from PIE root *sekw- (1) "to follow." Meaning "consequence" is attested from late 15c. Meaning "story that follows and continues another" first recorded 1510s.