Sings Bhagavad Gita:

“…rudrānām śankaraścāsmi…”
“I am Shankar among Rudr,..”

Sri Krishn is Shankar among Rudr.

Shankar-“shanka-ar’’-may be understood
as
the condition in which there are no doubts and irresolutions.

Gratitude: YouTube.
Humble Wishes..!!!