-lein

• -el, -l (chiefly dialectal)
• -le (chiefly dialectal)
• -li (in Swiss)
• -lin (chiefly Early New High German)
• -elein (chiefly in poetry)

From Middle High German -elīn, -līn, from Old High German -ilī, -ilīn.[1] Cognate to Dutch -lijn and English -lin.

• IPA^(key): /laɪ̯n/

-lein (plural -lein or -leins or -erlein)

1. suffix used to create a diminutive form; e.g., Kind → Kindlein

• In modern Standard German -lein is less common than, and often replaced by, -chen.
• The plural generally remains unchanged as it does with diminutives in -chen. A few nouns with a plural in -er may carry the same ending over to the plural diminutive. This is common with Kindlein → Kinderlein (and equally Kindchen → Kinderchen); otherwise it is rare. A few nouns referring to people allow a plural in -s. This is common with Fräulein → Fräuleins; otherwise it is, again, rare.

• -chen
• -erl
• -i