In general, there were great migrations from Estolad ("many thousands") to the realms of three houses of the noldor in Middle Earth, as told in Of the coming of Men into the West, Silmarillion - the reason being that the noldor saw hope in their great numbers in the war against Melkor. In particular, we know that Fingolfin, king of all the noldor, sent messages of welcome to them and Caranthir offer a part of his land and protection to the people of Haleth. For a good while, elves and men lived together in these realms - until the Firstborn realised that the Men need their own leaders and domains.
I believe they were most welcome in the land of Finrod Felagund, seeing that: he was the first to discover them; he often visited them before these great moves; he obtained from Thingol the permission for the people of Haleth to dwell in Brethil, (which Greymantle claimed as his own).
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