Nibble

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late 15th century: probably of Low German or Dutch origin; compare with Low German nibbeln ‘gnaw’.

wiktionary

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Probably of Dutch or Low German origin, perhaps from Middle Low German nibbelen(“to gnaw”), akin to modern Low German nibbeln(“to gnaw”) and Dutch nibbelen(“to nibble”), equivalent to nip +‎ -le(frequentative suffix). [1] Compare Saterland Frisian nibje(“to nibble”).

From nibble, punning on the homophony of byte and bite.

etymonline

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nibble (v.)

"to bite gently; eat by gnawing off small bits," c. 1500, not found in Middle English; perhaps from Low German nibbeln "to nibble, gnaw," related to Middle Low German nibbelen, Middle Dutch knibbelen "to gnaw," source of Dutch knibbelen "to cavail, squabble." Related: Nibbled; nibbling.

nibble (n.)

1650s, "act of nibbling," from nibble (v.). As "a small bite, a morsel" from 1838.