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English word leftern comes from English left, English -ern
left (English)
(politics) Pertaining to the political left.. The opposite of right; toward the west when one is facing north. On the left side.. Towards the left side. (boxing) A punch delivered with the left fist.. (politics) The ensemble of left-wing political parties. Those holding left-wing views as a group.. The left side or direction. .. Remaining. (Ireland, colloquial) permitted, allowed to proceed.
-ern (English)
(nonstandard, outside, fossilized words) Added to the names of directions to form adjectives.
leftern (English)
(nonstandard, rare) Left (opposite of right).