It is the Feast Day of a particular saint whose name you share. E.g. St. Joseph's Feast Day is March 19th. If you're named Joseph then I hope you had a happy Onomastic or "Name Day" this past March.

Fernando is a male proper name. I think it's Ferdinand in English. Its onomastic meaning is "brave and intelligent".

oleic as in oleic acid osteoblastic - description of a cell from which bone is formed onomastic - pertaining to a name oneirocritic - interpreter of dreams onomatopoeic - describing a word that suggests a sound

Yes.Santa Francesca Romana lived in Rome in 1384 and passed away the 9th of March of 1440.Her onomastic is the same day.
But the name Francesca can have the name day on the San Francesco's day too,the 4th of October.