Goodness

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Old English gōdnes (see good, -ness).

wiktionary

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From Middle English goodnesse, godnesse, from Old English gōdnes(“goodness; virtue; kindness”), equivalent to good +‎ -ness. Cognate with Old High German gōtnassī, cōtnassī(“goodness”), Middle High German guotnisse(“goodness”), Russian годность(godnostʹ, “suitability, fitness”).

etymonline

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goodness (n.)

Old English godnes "goodness, virtue, kindliness;" see good (adj.) + -ness. In exclamations from 1610s as a term of emphasis, first recorded in for goodnesse sake, i.e. "as you trust in the divine goodness" (i.e., God).