I always thought my name was more rare than this...
wilma is the #212 most common female name.
0.099% of females in the US are named wilma.
Around 126225 US females are named wilma!
source namestatistics.com
Whenever I tell someone my name, they almost always say they've never met someone with that name. If they don't, they precede to tell me the name of someone who had it and how they were surprised to meet another one, especially someone so young.