As a deity name
Name 71 of the Surya Sahasranāma — Bhavishya Purana, as taught by Lord Brahma / Sages
As a Hindi name
सुंदर
beautiful, pretty; good-looking, handsome
a Hindi word, a tatsama: the Sanskrit word borrowed unchanged into Hindi सुन्दर — per Wiktionary’s etymology record
“Borrowed from Sanskrit सुन्दर (sundara). Doublet of हुनर (hunar).” — per Wiktionary’s etymology record
sundara mf(ī)n. (perhaps for su-nara = sūnara; d being inserted as in Gk. ἀνδρός fr. ἀνήρ) beautiful, handsome, lovely, charming, agreeable, MBh.; Kāv. &c.
noble, Subh.
As a Sanskrit word
Meaning
beautiful, pretty; good-looking, handsome (a Hindi word, a tatsama: the Sanskrit word borrowed unchanged into Hindi सुन्दर; 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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