Elif (Turkish) and Alif (Arabic) is the name of the first letter of the Arabic alphabet (ا) — and by extension means "first," "beginning," or (metaphorically) "tall and slim" (because the letter is a single vertical stroke).
Elif is the most popular girl's name in Turkey and is widely used across the Turkic and Arab worlds. In Latin script, the spelling Elif is used in Turkish; Alif in Arabic.
Elif does not currently appear in the US Social Security Administration's top 1,000 girls' names, so we don't publish a US rank or birth count for it. That says nothing about the name's standing elsewhere in the world — only that it sits outside the ranked US data we rely on.
In Pythagorean numerology the letters of Elif reduce to 5, The Seeker. This is a traditional interpretive system, not a factual claim about the name.