Old English -isc

← Old English -isċe (alter)

← Middle English -isch (link)

← Proto-Germanic *-iską (inherited)

← Proto-Germanic *-iskiją (mention)

← Proto-West Germanic *-isk (inherited)

← Scots -ish (link)

→ English Greekish (mention)

→ English betwixen (mention)

→ Middle English -yssh (inherited)