Found 2 boys and girls with the meaning of eldest
Gauvain / 7 letters 
Meaning of Gauvain In Arthurian Legend, Gauvain means Eldest son of Lot More
Japheth / 7 letters 
Meaning of Japheth In Hebrew, Japheth means May he expand. Enlargement. May He grant ample room. Japheth was the eldest son of Noah in the Old Testament More

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singingsingssiren
sirenssistersister-in-law
sittingsixthskene
skiersskinnedskull
sky;chieftainslangslave
sleepsleepingslender
smallsmallpoxsmell