The meaning “battle worthy” is so strong and inspiring for a little girl. I love Matilda, but I think I actually prefer just Tilda. It’s minimalist and refreshing, a very unique alternative to the very popular full name.
This is very common in Sweden. I don't know when it entered the top 100, but I know it peaked at #19 in 2002. It was the 54th most popular name in 2009.
https://www.beliebte-vornamen.de/32852-tilda.htm
https://www.behindthename.com/name/tilda/top/germany-berlin
https://de.m.wikipedia.org/wiki/Tilda