Galswintha (c. 540-568) was the Visigothic princess (sister of Brunhilda) sent to marry Chilperic I of the Franks — murdered by her husband at the instigation of his mistress Fredegund, triggering the bloody Frankish civil war that consumed two generations.
Featured in Gregory of Tours's Histories.
Galswintha does not currently appear in the US Social Security Administration's top 1,000 girls' names, so we don't publish a US rank or birth count for it. That says nothing about the name's standing elsewhere in the world — only that it sits outside the ranked US data we rely on.
In Pythagorean numerology the letters of Galswintha reduce to 6, The Nurturer. This is a traditional interpretive system, not a factual claim about the name.