Middle English word swind comes from Proto-Indo-European *swey-, and later Proto-Germanic *swindaną (To dwindle.)

Detailed word origin of swind

Dictionary entry	Language	Definition
*swey-	Proto-Indo-European (ine-pro)	to twist, swing
*swindaną	Proto-Germanic (gem-pro)	To dwindle.
swindan	Old English (ang)	To waste away, languish, grow languid, be consumed.
swind	Middle English (enm)	To languish, waste away, also disappear, vanish.

Words with the same origin as swind