New Revised Standard Version
When they came to Marah, they could not drink the water of Marah because it was bitter. That is why it was called Marah.

Contemporary English Version
They did find water at Marah, but it was bitter, which is how that place got its name.

New American Bible
they arrived at Marah, where they could not drink its water, because it was too bitter. Hence this place was called Marah.

Douay-Rheims Bible
And they came into Mara, and they could not drink the waters of Mara because they were bitter: whereupon he gave a name also agreeable to the place, calling it Mara, that is, bitterness.

And they came into Mara, and they could not drink the waters of Mara because they were bitter: whereupon he gave a name also agreeable to the place, calling it Mara, that is, bitterness.

Marah

Numbers 33:8 And departing from Phihahiroth, they passed through the midst of the sea into the wilderness: and having marched three days through the desert of Etham, they camped in Mara.

marah.

Ruth 1:20 But she said to them: Call me not Noemi (that is, beautiful,) but call me Mara (that is, bitter), for the Almighty hath quite filled me with bitterness.