UK-based personalized entertainment company Lost My Name, creator of the bestselling print-on-demand title The Little Boy/Girl Who Lost His/Her Name, has received a new US$4.4 million funding injection from German early-stage investor and venture capital firm Project A.

As a new funding partner, Project A will look to strengthen Lost My Name in key areas such as IT, performance marketing and business intelligence.

Project A founding partner Florian Heinemann has also joined the startup’s board and will use his experience to help Lost My Name grow internationally.

The new funding is an extension of Lost My Name’s Series A round of financing, which raised US$9 million in 2015 from leading investors like Google Ventures, Greycroft and Allen & Co.

The Little Boy/Girl Who Lost His/Her Name was the top-grossing picture book of 2015 in the US and the UK, and 2015’s bestselling picture book in Spain, Italy and Australia. On Lost My Name’s website, parents enter their child’s name to generate a personalized version of The Little Boy/Girl Who Lost His/Her Name, which gets printed and shipped for US$29.99.

The book centers on a boy or girl who wakes up in the morning to find his or her name is missing, prompting readers to rediscover their names, letter by letter, as the adventure unfolds.

Since CEO and co-founder Asi Sharabi launched Lost My Name in 2013, the publisher has reached more than 1.5 million children worldwide across 170 countries.

A second Lost My Name personalized book, The Incredible Intergalactic Journey Home, launched in the UK and the US last fall and will roll out in Europe later this year. The company also plans to use its proprietary technology to expand into new areas of customization, animation and other physical products.