The name Lucasta is a girl's name of Latin origin meaning "pure light". Lucasta and is often added to lists like Old Lady Names and discussed in our forums with posts like "Names on NB that make you go WOW!".
From the experts:
Lucasta was invented by seventeenth century poet Richard Lovelace for a collection of poems dedicated to a lover named Lucy, and is familiar through the Eugene O'Neill play and film Anna Lucasta. Lucasta is a distinctive, rarely used choice and a logical extension of the Luke/Luc/Luca names.