A suffix from AS. -an, formerly familiar with develop the plural of many nouns, as in ashen, eyen, oxen, all obs. except oxen. In some cases, eg kiddies and brethren, it's been put into older plural forms.
A suffix corresponding to AS. -en and -on, formerly used to form the plural of verbs, as with housen, escapen.
A suffix signifying to make, to cause, regularly form verbs from nouns and adjectives; such as reinforce, quicken, frighten. This must not be mistaken for -en matching in Old English into the AS. infinitive closing -an.