Rogue Valley Roses seems to have Robert's Wondrous Ruthie in stock: https://roguevalleyroses.com/rose/roberts-wondrous-ruthie/

I hope you're successful in finding all the names you're looking for. I planned a grandchildren's rose bed a few years back, but was not able to complete it. I wish I had worked harder at it.

Are you familiar with all the mail order nurseries? If you're not, here are a few besides High Country Roses, which Magda mentioned .....

Rogue Valley Roses, Antique Rose Emporium, Palatine, Hortico, Edmunds, Regan, Roses Unlimited, Heirloom, Northland Rosarium, Corn Hill and Freedom Gardens for custom propagation. There are many more. They all have online catalogs with search tabs.

Also, Help Me Find is a site that might be helpful. Some roses have more than one name - one for European countries, another used in Australia and another used in the US. Help Me Find will help with that.

If there is a name you can't find, something representative of that child might work, such as Ballerina, Life of the Party, etc.

Good luck. I hope you find a beautiful rose for each name.