Old French seur

← French seu (mention)

← Old French sur (link)

← Old French sor (link)

← Old French soure (link)

← Old French souvre (link)

← Latin super (inherited)

← Latin sēcūrus (inherited)

← Latin sabūcus (mention)

← Latin sambūcus (mention)

→ English ensure (mention)

→ French sur (mention)

→ Old French asseurer (confix)

→ Norman seux (inherited)