John Gill Commentary Mark 6:54

"And when they were come out of the boat, straightway [the people] knew him," — Mark 6:54 (ASV)

And when they were come out of the ship
Christ and his disciples, and were ashore,

immediately they knew him ;
that is, the men of that place, as in Mt. 14:35, (See Gill on Matthew 14:35); and so the Syriac, Arabic, and Persic versions read here, "the inhabitants of that country", the country of Gennesaret; they knew him, having seen and heard him before.