For this Thelma Diane there are 3 different names on Yasni.
In the ranking of the most common first names Thelma Diane is on position 4588.
Male first name (German, English): Thelma; English (invented) the will thelema = (Greek), invented by the writer for the heroine of her novel 'Thelma: a society novel' (1887), perhaps derived from the Greek word "Thelema '(will)
Female first name (French, German): Diane, Latin (Roman mythology); deiwo = light, the light of day, the deity (Indo), in Roman mythology, Diana, the goddess of the hunt and the moon, the name goes back probably to an ancient Indo-European root, which also underlies 'Zeus'