As a Hindi name
झलज्झला · noun · feminine
बूँदों के गिरने का शब्द । वर्षा की झड़ी से उत्पन्न शब्द · हाथी के कान की फटफटाहट — Śabdasāgara
As a Sanskrit word
Meaning
the sound of falling drops, (v.l.)
Verified derivationWhy this matches what you typed
The spelling you confirmed, झलज्झला, is itself a dictionary headword — no grammatical transformation stands between what you typed and the meaning above.
Dictionary citations
jhalajjhalā f. (onomat.) the sound of falling drops, Amar. (v.l.)
the flapping of an elephant's ears (or of flaccid breasts &c.), Kām.
jhalajjhalā The noise of falling drops or of the flapping of an elephant's ears.
Caveats
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