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In earlier versions of the legendarium, until the era of the first edition of The Lord of the Rings, the name "Finrod" was given to the character later known as Finarfin. Finrod Felagund was at the time known as Inglor Felagund.
The name however was survived in the patronym Inglorion and perhaps in the Quenya form Ingalaurë. Because of that, some people speculate that Gildor Inglorion was Finrod's son, but there is much evidence to the contrary.
Inglor in the early appearances was interpreted as "heart-gold" (roots IND and G-LOR). Although the name Inglor(ion) is not analyzed in the later works, there is a similarity to Finarfin's mother-name, Ingalaurë. Therefore according to the more recent background, Inglor could be the Sindarin interpretation of that name, having a new etymology and meaning ("Vanya-gold").