Hedyle (Ἡδύλη) is from the Greek hēdys (sweet). Hedyle (3rd c. BCE) was the Greek epic poet of Athens — author of the lost epyllion Scylla on the sea-monster's transformation. Mother of the epigrammatist Hedylus, daughter of the iambic poet Moschine.
Three generations of Greek poets, mother to son.
Hedyle does not currently appear in the US Social Security Administration's top 1,000 girls' names, so we don't publish a US rank or birth count for it. That says nothing about the name's standing elsewhere in the world — only that it sits outside the ranked US data we rely on.
In Pythagorean numerology the letters of Hedyle reduce to 5, The Seeker. This is a traditional interpretive system, not a factual claim about the name.