This is the 987th most frequent Icelandic word.
fjölskyldur
"Fjölskyldur" means "families" in English.
In this sentence, "fjölskyldur" is the object in the plural form, designating several families that were introduced.
Við kynntum nýjar fjölskyldur sem fluttu inn í hverfið.
We met new families who moved into the neighborhood.
"Fjölskyldur" here refers to groups of people related to one another in the plural form, being the direct object receiving aid.
Margir styðja fjölskyldur þeirra sem þurfa hjálp.
Many support families who are in need of help.
Here, "fjölskyldur" is in the plural form and functions as the subject in the sentence, indicating that multiple families are gathering.