Sparkle

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Middle English: frequentative (verb) or diminutive (noun) of spark1.

wiktionary

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From Middle English sparkel, sparkle, sparcle, equivalent to spark +‎ -le(diminutive suffix).

From Middle English sparklen, sperclen, equivalent to spark +‎ -le(frequentative verb). Cognate with Dutch sparkelen(“to sparkle”).

etymonline

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sparkle (v.)

c. 1200, "to shine as if giving off sparks," frequentative verb form of Middle English sparke (see spark (v.)). Meaning "emit sparks" is from late 15c. Related: Sparkled; sparkling.

sparkle (n.)

early 14c., from sparkle (v.), or a diminutive of spark (n.).