Marilou

This name is most commonly used in the Philippines as a short form of Maria Lourdes (not María Lourdes) [noted -ed]

---

https://en.wiktionary.org/wiki/Marilou
https://forebears.io/forenames/marilou

---

Another less common, but still-heard-of short form of Maria Lourdes is Malou.

I hear this name often in Québec. It's an all encompassing name fun, smart, strong, sensitive and feminine.