Any word can be someones name. Its unique.
Iris.
Yes, because you are talking about someones name
The word "star" should be capitalized when it is part of a proper noun such as the "Star of Bethlehem" or a specific name like "North Star." Otherwise, in general usage, it should not be capitalized.
someones culture
Chaim (חיים) is an actual Hebrew name that means "Life".
It doesn't mean anything other than someones name.
You can't hashtag their name but you can hashtag a phrase or a word. For example: #happy #excited #love. Hope that answered your question!! :)
babysitting
rage
Someones last name.
The archaic word for "window" is "embrasure." Technically, the word "embrasure" could be used for a window or the opening for a door.