🔼The name Shimshai in the Bible
There's only one man named Shimshai in the Bible. He is the Samaritan scribe who penned down the letter that commander Rehum and several others had composed in order to convince king Artaxerxes that the new and restored Jerusalem was going to be as rebellious and troublesome as the old Jerusalem had been (Ezra 4:8). When Artaxerxes responds with a decree that the Jews have to stop working, Shimshai, Rehum and others hurry to Jerusalem to force the Jews to abandon the restorations.
🔼Etymology of the name Shimshai
The name Shimshai comes from the noun שמש (shemesh), meaning sun:
The letter י (yod) upon which our name ends may either denote a possessive form (my sun), or it marks an adjective (sunny or belonging to the sun), or it is a remnant of יה (Yah) = יהו (Yahu) = יו (Yu), which in turn are abbreviated forms of the Tetragrammaton; the name of the Lord: YHWH.
For a meaning of the name Shimshai, NOBSE Study Bible Name List sees an adjective and reads Sunny. Alfred Jones (Dictionary of Old Testament Proper Names) thinks the י marks the name of the Lord and reads Sun Of The Lord.