Old English sēoc

→ English sick (inherited)

→ Old English suht (suffix)

→ Old English seocnes (suffix)

→ Old English wæterseoc (compound)

→ Old English deofolseoc (compound)

→ Old English fielleseoc (compound)

→ Middle English sik (mention)

→ Old High German sioh (cognate)

→ Old Norse sjúkr (cognate)

→ Old Saxon siok (cognate)

→ Yola zeek (mention)