Question

why did Sher Shah get the title of Sher Khan​

Answer 1

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Because of his valour, Bahar Khan rewarded him the title Sher Khan (Lion Lord). After the death of Bahar Khan, Sher Khan became the regent ruler of the minor Sultan, Jalal Khan.

Answer 2

He was given the title of Sher Khan by Bahar Khan, for the courage and gallantry shown by him in killing a tiger single-handedly. Later Bahar Khan appointed him as a deputy governor and tutor of his son Jalal Khan.