AITA for naming my kids after songs?

So I (YAF) and husband (YAM) have two kids. A son (Infant) we named COSOSOM and a daughter (Newborn) we named WAOLOM. Unfortunately, my FIL thinks that the names are “stupid” and “dumb” but I think they’re great. These are names that will last GENERATIONS. Plus, my FIL can’t really complain since he is named “Rex” and his parents were “Tomothy ” and “Tamathy”. COSOSOM and WAOLOM are so much better. But AITA for their names?