Elgar is of Germanic origin and means "noble spear". It was popularized by Sir Edward Elgar, an English composer famous for works such as "Pomp and Circumstance" and "The Dream of Gerontius". The name has been associated with music and the arts since his time.
"Elgar is a rare name with only 63 recorded births across the nine years mentioned. The most popular period was between 1920 and 1922, with each year seeing 9 births."