hugo/docs/content/en/functions/title.md

title	description	godocref	date	publishdate	lastmod	categories	menu	keywords	signature	workson	hugoversion	relatedfuncs	deprecated	aliases
title	Converts all characters in the provided string to title case.		2017-02-01	2017-02-01	2017-02-01	functions	docs parent functions	strings	title INPUT				false

{{title "BatMan"}}` → "Batman"

Can be combined in pipes. In the following snippet, the link text is cleaned up using humanize to remove dashes and title to convert the value of $name to Initial Caps.

{{ range $name, $items := .Site.Taxonomies.categories }}
    <li><a href="{{ printf "%s/%s" "categories" ($name | urlize | lower) | absURL }}">{{ $name | humanize | title }} ({{ len $items }})</a></li>
{{ end }}