English mourn

← Old English murnan (inherited)

← Middle English mornen (inherited)

← Middle English mournen (mention)

← French morne (cognate)

← Proto-Germanic *murnaną (cognate)

← Proto-Indo-European *(s)mer- (remember) (root)

→ English remember (link)

→ English mournful (suffix)

→ English mourner (suffix)

→ English mourneth (suffix)

→ English bemourn (prefix)

→ English mournest (suffix)

→ English mournsome (suffix)

→ English overmourn (prefix)

→ French morne (cognate)

→ Old Norse morna (cognate)