Tippa will probably be masculine, but it's a byname, or abbreviation, not a full name. As such there could be many different origins, and the form Tippa, is more likely the
Norman form, not the Old English (the phoneme |p| is extremely rare in native Old English words). Among the possibilities are Tilberht, Tidbeald, or a continental name such as Thiodbald (
Tybalt). In all these cases we know that both the |lb| and |db| are frequently reduced to |bb| or |b|, and the |b| pronounced as |p| in some parts of
Europe (cf. names such as
Rupert). There recorded names Tibba a.k.a. Tilba with no further hint of the original. There's an outside chance it could go back as far as a British name, where |p| is more common, but a
Norman, rather than an English name is more likely.