For me, it's Martin Luther Day, rather than MLK day.

Who did the parents of Martin Luther King Jr. name their child after? M.L. -- that is Martin Luther.  There were reasons of religion in this. Unfortunately MLK Jr. did not honor his namesake in his teaching which largely departed from Christianity.
The names "Martin Luther" and "Luther" were sporadically used among the names of black people of a generation ago before the Muslim influence became more prominent.
I will honor the man for whom Martin Luther King Jr. was named after, also for reasons of religion... the true Christian religion.
I will spite the world by calling this day:

"Martin Luther Day"