What does it mean for a Christian to be baptized with a particular name?
"In the name of the Father and of the Son and of the Holy Spirit", the person is baptized with a name. The name and the face are ultimately what make a person unique, even in God's sight. "Fear not, for I have redeemed you; I have called you by name, you are mine" (Is 43:1).
Christians treat the name of a person reverently, because the name is profoundly connected with that person's identity and dignity. From time immemorial Christians have selected names for their children from the list of the saints; they do so in the belief that the patron saint is an example for them and will intercede with God for them in a special way.
Why do Jews celebrate the Sabbath?
The sabbath is for the people of Israel the great sign commemorating God, the Creator and Redeemer.
The sabbath recalls in the first place the seventh day of creation, when God "rested, and was refreshed" (Ex 31:17), this, so to speak, authorizes all men to interrupt their work and replenish their energies. Even slaves were supposed to be allowed to observe the Sabbath. This recalls the second great commemorative sign, the liberation of Israel from slavery in Egypt: "You shall remember that you [yourself] were a servant in the land of Egypt ... " (Dt 5:15). The Sabbath is therefore a feast of human freedom; on the Sabbath all breathe freely; on it the division of the world into masters and slaves is abolished. In traditional Judaism this day of freedom and rest is also a sort of foretaste of the world to come. (YOUCAT questions 361-362)
Dig Deeper: CCC section (2168-2172) and other references here.
Part 3: Life in Christ (1691 - 2557)
Section 2: The Ten Commandments (2052 - 2557)
Chapter 1: You Shall Love the Lord Your God with All Your Heart, and with All Your Soul, and with All Your Mind (2083 - 2195)
Article 3: The Third Commandment (2168 - 2195)
Remember the sabbath day, to keep it holy. Six days you shall labor, and do all your work; but the seventh day is a sabbath to the Lord your God; in it you shall not do any work.90
The sabbath was made for man, not man for the sabbath; so the Son of Man is lord even of the sabbath.91 ⇡
I. THE SABBATH DAY ⇡
The third commandment of the Decalogue recalls the holiness of the sabbath: "The seventh day is a sabbath of solemn rest, holy to the LORD."92
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Ex 20:8-10; cf. Deut 5:12-15.
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In speaking of the sabbath Scripture recalls creation: "For in six days the LORD made heaven and earth, the sea, and all that is in them, and rested the seventh day; therefore the Lord blessed the sabbath day and hallowed it."93
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Scripture also reveals in the Lord's day a memorial of Israel's liberation from bondage in Egypt: "You shall remember that you were a servant in the land of Egypt, and the LORD your God brought you out thence with mighty hand and outstretched arm; therefore the LORD your God commanded you to keep the sabbath day."94
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God entrusted the sabbath to Israel to keep as a sign of the irrevocable covenant.95 The sabbath is for the Lord, holy and set apart for the praise of God, his work of creation, and his saving actions on behalf of Israel.
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Cf. Ex 31:16.
God's action is the model for human action. If God "rested and was refreshed" on the seventh day, man too ought to "rest" and should let others, especially the poor, "be refreshed."96 The sabbath brings everyday work to a halt and provides a respite. It is a day of protest against the servitude of work and the worship of money.97
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Cf. Neh 13:15-22; 2 Chr 36:21.