Some feminine agental suffixes were mentioned in Notes on Galadriel’s Song (NGS) from the late 1950s or early 1960s: -lle, -lde, and -nde, the first of which was an element in the name Tintallë (PE17/69). In NGS Tolkien said -lle was used less frequently as an agental suffix because -lle was also the 2nd person plural subject suffix “you (pl.)”. In fact, in notes on Words, Phrases and Passages from the Lord of the Rings (WP2) from this same period Tolkien considered changing Varda’s sobriquet to Tintalde (PE17/69).

However, in the late 1960s Tolkien decided the 2nd person plural suffix was actually -lde (VT49/16, 51), so presumably -lde would then be the less common agental suffix and -lle more common. Tolkien was considering -lde for 2nd plural as early as 1959, and in the 1959 page which specified -lde for 2nd plural, Tolkien also designated -lle for a feminine agent, the equivalent of masculine -ndo (PE17/190).

As for -nde, it was most notable as an element in Serindë “Broideress, Needlewoman” (S/63; MR/257; PM/333).