French donc

← Catalan doncs (cognate)

← Middle French donc (inherited)

← Middle French doncques (mention)

← Old French donkes (inherited)

← Old French adonc (mention)

← Italian dunque (cognate)

← Latin (inherited)

← Latin dum (mention)

← Latin tum (mention)

← Latin tunc (mention)

← Romanian atunci (cognate)

→ English I think therefore I am (link)

→ Catalan doncs (cognate)

→ Dalmatian duanc (cognate)

→ Esperanto do (derived)

→ French adonc (prefix)

→ French mais où est donc Ornicar (link)

→ Friulian doncje (cognate)

→ Italian dunque (cognate)

→ Latin cogito, ergo sum (link)

→ Ladin donca (cognate)

→ Norman daonc (cognate)