Julien Baker is an American singer-songwriter from Tennessee. In addition to her own works, she is also 1/3 of the band Boygenius, alongside fellow artists Phoebe Bridgers and Lucy Dacus.
Julien Boisselier is a French actor. Boisselier was born and raised in Nantes before moving to Paris to study comedy at Le Cours Florent. He dated acclaimed French actress Mélanie Laurent, though the two ended their relationship in February 2009. She dedicated her 2006 César Award for Most Promising Actress to him, which she won for Je vais bien, ne t'en fais pas.
The name Julien was really popular in France during the 80's and 90's, so much so that it became the 26th most common name for baby boys in the 20th century despite the fact that it was quite rare until the 80's. It is still a top 100 name, but I personally find it a little dated. It's kind of like Jason in a sense. Not bad names, just overused at a certain point in time.