Summer Louise Truswell is a textile artist worth a Google. She uses her full name for web addresses but seems to be known as Summer to friends and family. I assumed at first that she was known as Summer Louise, which gave Summer an air of legitimacy! And combinations like Anne-Louise are quite normal ... But just plain Summer all by itself seems unsuccessful (and I do speculate about siblings called Spring and Fall ...)and as if the parents are trying too hard. I dislike month names, but June would work better. Summer is a bummer!
Do I understand you correctly? This tiny new baby was born in autumn, right? Weird! Oh well. Isaak looks like a spelling error, and at least she isn't a Summar or something.