🔼The name Seirah in the Bible
The name Seirah (which is actually spelled "Seirath," and only the King James Version prints it that way) occurs only once in the Bible. It's the name of the city to which the judge Ehud escaped after he had killed king Eglon in his castle (Judges 3:26).
🔼Etymology of the name Seirah
The name Seirah, or rather Seirath is the name Seir with the letter ת (taw) stuck to it. This final letter taw is probably an ancient equivalent of what in the time of the writing of the Bible had become the final ה (he), namely a feminine extension. Since the English language doesn't reflect genders, we're a bit stuck with interpreting the name Seirah, but it would be something like She-Seir or Lady-Seir. And like the name Seir, the name Seriah is probably associated with the following root cluster:
For a meaning of the name Seirah, NOBSE Study Bible Name List reads Rough. Jones' Dictionary of Old Testament Proper Names curiously omits the name Seirah, but reads Rough, Bristly for Seir. BDB Theological Dictionary lists the name Seirah under the root שׂער (s'r I) and endorses the interpretation of Gesenius, who proposed Goat.