Godson

wiktionary

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From Middle English godsone, gossone, from Old English godsunu(“godson”), equivalent to god +‎ son. Cognate with Danish gudsøn(“godson”), Swedish gudson(“godson”), Icelandic guðsonur(“godson”).

etymonline

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godson (n.)

"male child one sponsors at baptism," c. 1200, from God + son, replacing or modifying Old English godsunu.