"Many wandmakers simply match the wand length to the size of the witch or wizard who will use it, but this is a crude measure, and fails to take into account many other, important considerations. In my experience, longer wands might suit taller wizards, but they tend to be drawn to bigger personalities, and those of a more spacious and dramatic style of magic. Neater wands favour more elegant and refined spell-casting. However, no single aspect of wand composition should be considered in isolation of all the others, and the type of wood, the core and the flexibility may either counterbalance or enhance the attributes of the wand’s length.

Most wands will be in the range of nine and fourteen inches. While I have sold extremely short wands (eight inches and under) and very long wands (over fifteen inches), these are exceptionally rare. In the latter case, a physical peculiarity demanded the excessive wand length. However, abnormally short wands usually select those in whose character something is lacking, rather than because they are physically undersized (many small witches and wizards are chosen by longer wands).

Wand flexibility or rigidity denotes the degree of adaptability and willingness to change possessed by the wand-and-owner pair - although, again, this factor ought not to be considered separately from the wand wood, core and length, nor of the owner’s life experience and style of magic, all of which will combine to make the wand in question unique." 

- A direct quote from Mr. Garrick Ollivander on Wand Properties-

 There is not much recorded information on wand length and its relation to whom it choose as an owner. After searching through everything i can find and interview several wandmakers, i find that Garrick Ollivander's personal notes on the matter best summarize it. Wand length in regards to choosing its owner will generally pick someone of similar physical features. But remember that the materials the wand is made out of have an ever greater affect on who it picks. 

  All wands have their individual lengths and may also be some correlation between a person's size and the lengths of their wands. Rubeus Hagrid, who is a half-giant , owned one of the longest known wands: it was sixteen inches long and made of oak. The shortest known wands once belonged to Dolores Umbridge who is described as being squat and toad-like. Meaning that wands do indeed have odds of resembling their owners, and proving Garrick Ollivander was correct in his studies.

Since numbers have been known to have correspondence with magical properties, a wand's length, much like its core, may symbolize something about it's owner. For example, the wand of Tom Riddle(Lord Voldermort) measures 13 1/2 inches. The number Thirteen is commonly referred to as an omen of misfortune or evil. This study of Wandlore is not typically looked into often, it is still interesting to see the connections.

(QUICK NOTES)

-Wands will generally select owners with similar physical features (A longer wand will generally select a tall owner)

-No single aspect of wand composition should be considered when looking it who a wand will select 

-The type of wood, the core and the flexibility may either counterbalance or enhance the attributes of the wand’s length 

-Generally wand sizes are 8 to 14 inches in size (though other sizes have been seen before)

-A wand's length may also affect how it chooses someone, based on a person's future, just as wood types and core types do

-Other known reasons for who a wand may select

~ Abnormally short wands usually select those in whose character something is lacking

~Neater wands favor more elegant and refined spell-casting

~Longer wands might suit taller wizards, but they tend to be drawn to bigger personalities, and those of a more spacious and dramatic style of magic