Struggling! Back and forth with SO, advice please

Brianna • FTM-June.04.2016, i love you son👑💙🚘
So i really love love love the name Rylan for my son. But my SO dosent like it because my ex's name is Ryan. I understand why he would be upset, but my mom helped me pick the name Rylan, and my SO is stuck on the name Cash or Shane. Which shane is cute too. I dont want my past dictating my furture. And i honestly didnt think of rylan sounding close to my exs name until my SO mentioned it. Rylan is the first name ive come across that ive been like omg love it!! Im 30w2d and i just need some advice