Respective

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late Middle English (in the sense ‘relative, comparative’): from medieval Latin respectivus, from respect- ‘regarded, considered’, from the verb respicere (see respect), reinforced by French respectif, -ive .

wiktionary

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Borrowed from Medieval Latin respectivus, from Latin respectus. Equivalent to respect +‎ -ive.

etymonline

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respective (adj.)

mid-15c., "relative, having relation or reference to something" (a sense now obsolete), from Medieval Latin respectivus "having regard for," from Latin respect- past-participle stem of respicere "look back at, regard, consider" (see respect (v.)). The meaning "relating or pertaining severally each to each, connected with each of those in question" is from 1640s.