As a deity name
Name 199 of the Shiva Sahasranāma — Mahabharata (Anushasana Parva), as taught by Sage Tandi to Sage Upamanyu
As a Hindi name
गंभीर
deep; serious, grave
a Hindi word, a tatsama: the Sanskrit word borrowed unchanged into Hindi गम्भीर — per Wiktionary’s etymology record
“Borrowed from Sanskrit गम्भीर (gambhīra).” — per Wiktionary’s etymology record
gambhīra mfn. = gabh˚, RV. (only in the beginning of Pādas, six times), AV. &c. (in post-Vedic writings gambh˚ is more used than gabh˚; the deepness of a man's navel, voice, and character are praised together, VarBṛS. lxviii, 85; hence a person who is said to have a deep navel, voice, and character is called tri-gambhīra mf(ā)n., MBh. iv, 254; v, 3939)
gambhīra m. (= jambh˚) the lemon tree, L.
As a Sanskrit word
Meaning
deep (a Hindi word, a tatsama: the Sanskrit word borrowed unchanged into Hindi गम्भीर; per Wiktionary’s etymology record)
Scripturally attestedWhy this matches what you typed
No corroborated Sanskrit reading of this spelling is established. It resolves as a Hindi word — see “As a Hindi name” above. We say this plainly rather than force a Sanskrit story onto it.
Caveats
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