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Klay Thompson 's sticking with nautical tradition -- naming his boat after a woman -- namely, his rapper better half Megan Thee Stallion !

The 4-time NBA champion shared a series of pics chronicling the Dallas Mavericks' recent West Coast road trip as well as his Thanksgiving meal ... captioning the post, "West coastin’."

Buried in the photo dump's a picture of the back of his boat ... which he's named the "S.S. Stallion" ... clearly a reference to Megan.

For further evidence, just look at the city and state he listed under the name ... Houston, Texas ... a place Klay doesn't really have a connection to, but one MTS calls home.

A woman -- presumbably Megan -- is standing in a pair of tall brown boots and tight jeans in the pic with her back to the camera. Gall

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