As a deity name
Name 327 of the Narasimha Sahasranāma — Brahmanda Purana / Narasimha Purana, as taught by Sages to Assembly of Devotees
As a Hindi name
जलना
to burn, be on fire; to ignite
a Hindi word of Middle Hindi origin; it is not Sanskrit — per Wiktionary’s etymology record
“Hindi verb set जलना (jalnā) जलाना (jalānā) जलवाना (jalvānā) Etymology tree Proto-Indo-European *ǵwelH- Sanskrit ज्वल् (jval) Sanskrit ज्वलति (jvalati) Prakrit 𑀚𑀮𑀇 (jalaï) Apabhramsa जलइ (jalaï) Hindi जलना Inherited from Apabhramsa जलइ (jalaï), from Prakrit 𑀚𑀮𑀇 (jalaï), from Sa…” — per Wiktionary’s etymology record
As a Sanskrit word
Meaning
lying in water
Scripturally attestedWhy this matches what you typed
M1 · same meaning "jalaśāyine" is the dative of "jalaśāyin" — the same word in a different grammatical case.
Dictionary citations
jala—śāyin mfn. lying in water, R. i, 43, 14
jala—śāyin m. = -śaya
Caveats
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