English each other

← Old English ǣlċ ōþer (inherited)

← English each (affix)

← English other (affix)

← Middle English ech other (inherited)

← Middle English yche othere (mention)

← Middle English ich othir (mention)

← Middle English eche other (mention)

← Middle English ilk oþer (mention)

← West Frisian elkoar (cognate)

← Dutch elkander (cognate)

← Dutch elkaar (mention)

← Scots ilk other (cognate)

→ English eachother (mention)

→ German einander (mention)

→ Portuguese se (link)