The wolf is nicknamed Abu Ja'dah. الذَّئْبُ يُكْنَى أَبَا جَعْدَةَ‏.‏

It is said that Ja'dah is a young sheep, and the wolf is nicknamed after it because it targets and seeks out sheep due to their weakness and gentleness. It is also said that Ja'dah is a fragrant plant that grows in spring and dries quickly. Similarly, if a wolf is honored with a nickname, it will quickly become treacherous and will not remain in one state. Another interpretation is that the wolf, though its nickname may be good, acts reprehensibly. Yet another explanation is that it originated with 'Ubayd ibn al-Abras when Nu'man ibn al-Mundhir wanted to kill him. This proverb is used to describe someone who flatters with words but intends harm. Ibn al-Zubayr was asked about temporary marriage (mut'ah), and he said: "The wolf is nicknamed Abu Ja'dah," meaning that it is a good nickname for a cunning wolf. Likewise, temporary marriage has a good name but a bad meaning.
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The proverb "The wolf is called Abu Ja'dah" is used to describe someone who feigns kindness and pleasant speech, or who bears a good name, while concealing malice and deceit, or someone who speaks well but harbors ill intentions.
One of the closest English equivalents is:
"A wolf in sheep's clothing."
This is the most famous and closest English proverb to this meaning.
"Fair words, foul deeds."
"Honey in the mouth, poison in the heart."
"Beware of a smiling enemy."
"Fine feathers do not make fine birds."
The closest equivalent to the Arabic proverb is:
"A wolf in sheep's clothing."
"A wolf in sheep's clothing."
Because it combines outward goodness with inward malice, which is exactly what the Arabic proverb meant.
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يقال‏:‏ إن الجَعْدَة الرِّخْلُ، وهي الأنثى من أولاد الضأن، يكنى الذئب بها لأنُه يقصدها ويطلبها لضعفها وطيبها، وقيل‏:‏ الجَعْدة نبت طيب الرائحة ينبت في الربيع ويجفُّ سريعاً، فكذلك الذئب إن شَرُف بالكنية فإنه يغدر سريعاً، ولا يبقى على حالة واحدة، وقيل‏:‏ يعني أن الذئب وإن كانت كنيته حسنة فإن فعله قبيح، وقيل‏:‏ إنه لعَبيد بن الأبرص قاله حين أراد النعمان ابن المنذر قتله‏.‏
يضرب لمن يبرك باللسان ويريد بك الغَوَائل‏.‏
وسئل بن الزبير عن المتعة، فقال‏:‏ الذئب يكنى أبا جعدة، يعني أنها كنية ‏حسنة للذئب الخبيث، فكذلك المتعة حسنة الاسم قبيحة المعنى‏.‏

That is one of the unique ones. ذَاكَ أَحَدُ الأحَدِينَ‏.‏

Ibn al-A'rabi said: This is the most eloquent praise. He said: It is said, "One of the unique ones," just as you say, "One without peer." It is also said, "So-and-so is one of the unique ones," and "One of the unique ones." Their saying, "This is one of the unique ones," they said: The feminine form is for emphasis, meaning a cunning person. And they recited:
They counted me as a fox among their enumerations, until they provoked me to one of the unique ones.
This is said of someone whose cunning has no end, and who has no equal in his wickedness.
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This proverb is used to describe someone who has reached the pinnacle of excellence, cunning, or uniqueness, becoming unparalleled. Some of the closest English equivalents are:
“One of a kind.”
Meaning: Unique and without equal.
This is the most common and general equivalent.
“Second to none.”
Meaning: No one precedes him, and he has no equal.
“In a league of his own.”
Meaning: He is in a league of his own.
This is said of someone who clearly surpasses everyone.
“A master of cunning.”
Meaning: Extremely skilled in cunning and deceit.
This is closest to the aspect of cunning and deceit in the proverb.
“There’s no one like him.”
Meaning: No one is like him.
The closest expression that combines the meaning of uniqueness and cunning is:
“He is in a league of his own.”
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قال ابن الأعرابي‏:‏ هذا أبْلَغُ المَدْحِ، قال‏:‏ ويقال ‏"‏إحدى الإحَدِ‏"‏ كما تقول‏:‏ واحد لا نَظِيرَ له، ويقال‏:‏ فلان وَاحدُ الأحَدِينَ، ووَاحِدُ الآحادِ، وقولهم ‏"‏هذا إحْدَى الإحَدِ‏"‏ قالوا‏:‏ التأنيث للمبالغة، بمعنى الداهية، وأنشدوا‏:‏

عَدُّونِيَ الثَّعْلَبَ فِيمَا عَدَّدُوا * حَتَّى اسْتَثَارُوا بِيَ إحْدَى الإحَدِ 

يضرب لمن لا نهاية لدهائه، ولا مِثْلَ له في نَكْرَائه‏.‏

It is a great wonder...... إنه لهتر أهتار

  The wonder: the marvel and the cunning. It is used to describe a cunning and deceitful man. Some say: In the language, wonder is called wonder. So the cunning man is named after it as if time created him and brought him out to people so that they would marvel at him. And wonder is falsehood, so if it is said that so-and-so is wonder, it means that because of his cunning he presents falsehood in the guise of truth, so he is never free from falsehood, so they made him falsehood itself, as in the saying of Al-Khansa: For it is only coming and going. And he added it to his kinds, indicating that he was distinguished from them by a characteristic that made him superior to them, and similar to it is the sound of the sound, and its origin is the snake that is in the sound, which is the dry land.

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Some of the closest English equivalents are:

He’s a real cunning fox.

He’s too clever by half.

Said of someone who is extremely cunning and deceitful.

A master of deceit.

He can make black look white.

This is very close to the meaning mentioned in the explanation; that is, he can make falsehood appear as truth.

To indicate extreme cunning and shrewdness:

He’s one in a million.

If the meaning of wonder and uniqueness is intended.

The closest explanatory translation of the proverb is:

He is extraordinarily cunning, making falsehood appear as truth.Some of the closest English equivalents are:

He’s a real cunning fox.

He’s too clever by half.

Said of someone who is extremely cunning and deceitful.

A master of deceit.

He can make black look white.

This is very close to the meaning mentioned in the explanation; that is, he can make falsehood appear as truth.

To indicate extreme cunning and shrewdness:

He’s one in a million.

If the meaning of wonder and uniqueness is intended.

The closest explanatory translation of the proverb is:

He is extraordinarily cunning, making falsehood appear as truth. 

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الهتر: العجب والداهية. يضرب، للرجل الداهي المنكر. قال بعضهم: الهتر، في اللغة، العجب. فسمي الرجل الداهي به كأن الدهر أبدعه وأبرزه للناس ليعجبوا منه، والهتر الباطل فإذا قيل فلان هتر أي من دهائه يعرض الباطل في معرض الحق فهو لا يخلو أبداً من باطل فجعلوه نفس الباطل كقول الخنساء: فإنما هي إقبال وإدبار وأضافه إلى أجناسه إشارة إلى أنه تميز منهم بخاصية يفضلهم بها ومثله، صل أصلال وأصله الحية تكون في الصلة وهي الأرض اليابسة.