Meaning of our names and surnames! :P

Mia Hayden:
Mia:
Danish and Swedish: pet form of Maria. It is now also used in the English-speaking world, largely as a result of the fame of the actress Mia Farrow (b. 1945).
(we want to add that "Mia" is a spanish word too, that in english is "mine").

Hayden:

1. Irish: reduced form of O’Hayden, an Anglicized form of Gaelic Ó hÉideáin and Ó hÉidín ‘descendant of Éideán’ or ‘descendant of Éidín’, personal names apparently from a diminutive of éideadh ‘clothes’, ‘armor’. There was also a Norman family bearing the English name (see 2 below), living in County Wexford.
2. English: habitational name from any of various places called Hayden or Haydon. The three examples of Haydon in Northumberland are named from Old English heg ‘hay’ + denu ‘valley’. Others, for example in Dorset, Hertfordshire, Somerset, and Wiltshire, get the name from Old English heg ‘hay’ (or perhaps hege ‘hedge’ or (ge)hæg ‘enclosure’) + dun ‘hill’.

Josephine Jonas:
Josephine:
English form of Joséphine, now widely adopted in the English-speaking world. Cognates: Irish Gaelic: Seosaimhín. Italian: Giuseppina.

Short form: English: Jo.

Pet forms: English: Josie, Josette, Fifi, Posy.

Jonas:

1. English, German, French, Jewish (Ashkenazic), Lithuanian, Czech and Slovak (Jonáš), and Hungarian (Jónás): from a medieval personal name, which comes from the Hebrew male personal name Yona, meaning ‘dove’. In the book of the Bible which bears his name, Jonah was appointed by God to preach repentance to the city of Nineveh, but tried to flee instead to Tarshish. On the voyage to Tarshish, a great storm blew up, and Jonah was thrown overboard by his shipmates to appease God’s wrath, swallowed by a great fish, and delivered by it on the shores of Nineveh. This story exercised a powerful hold on the popular imagination in medieval Europe, and the personal name was a relatively common choice. The Hebrew name and its reflexes in other languages (for example Yiddish Yoyne) have been popular Jewish personal names for generations. There are also saints, martyrs, and bishops called Jonas venerated in the Orthodox Church. Ionas is found as a Greek family name.
2. Jewish (Ashkenazic): respelling of Yonis, with Yiddish possessive -s.