🔼The name Tidal in the Bible
The name Tidal occurs in only once context in the Bible, namely that of the War of Four Against Five Kings (Genesis 14).
King Tidal of Goiim joined forces with king Amraphel of Shinar, king Arioch of Ellasar and Chedorlaomer of Elam in order to quell an uprising of five Canaanite vassal kings: Bera of Sodom, Birsha of Gomorrah, Shinab of Admah and Shemeber of Zeboiim. Directly after the five were beaten (and Abram rescued Lot, who had managed to have himself abducted in the process) Abram met Melchizedek and some of the core procedures of later Yahwism were established (Genesis 14:17).
It's not clear whether Goiim was actually a proper name of Tidal's kingdom, which accidentally happened to sound like a Hebrew word meaning "nations" or that Tidal was the face of some freshly established (nameless) federation of tribes which joined the three kings as one.
🔼Etymology of the name Tidal
The name Tidal appears to have very little meaning in Hebrew, or at least as can be deducted from the Hebrew of the Bible (which of course is a mere section of the Hebrew that actually existed); the root דעל (d'l) does not exists and although על ('al) means 'up' (see the names Eli and Elyon), there is no word תד (td), תדה (tdh) or even תוד (twd).
A very creative (or confused) member of a Hebrew audience might see a resemblance of our name with the reverse of the phrase על תודה, meaning For Thanksgiving as occurring in Leviticus 7:12. The word תודה (toda) comes from the verb ידה (yada), meaning to confess, praise, give thanks (see the name Judah). That would suggest a meaning of our name of High Praise.
For a meaning of the name Tidal, NOBSE Study Bible Name List reads Splendor and Jones' Dictionary of Old Testament Proper Names has Fear, Reverence (drawn from a Samaritan root meaning just that). BDB Theological Dictionary does not offer an interpretation of our name but does report that the name Tudhula occurs on late Babylonian tablets, which might have given rise to our name Tidal.